📚 KS3 OCR Philosophy: Core Knowledge Review | KS3 OCR 哲学：核心知识点梳理
Philosophy at KS3 level introduces students to some of the biggest questions humanity has ever asked. This article provides a structured review of core knowledge for the OCR KS3 Philosophy specification, covering key concepts, thinkers, thought experiments, and branches of the subject. Grasping these foundations will help you engage with philosophical problems and sharpen your critical thinking skills.
KS3 阶段的哲学引导学生探索人类有史以来提出的最重大的问题。本文针对 OCR KS3 哲学课程要求，系统地梳理核心知识点，涵盖关键概念、思想家、思想实验以及哲学的主要分支。掌握这些基础将有助于你深入哲学问题，并磨砺批判性思维能力。
1. What is Philosophy? | 什么是哲学？
Philosophy comes from the Greek words 'philo' (love) and 'sophia' (wisdom), literally meaning 'love of wisdom'. It is the rational investigation of fundamental questions about existence, knowledge, values, reason, mind, and language. Unlike the sciences, which rely heavily on experiments, philosophy progresses through logical argument, thought experiments, and conceptual analysis. Philosophers are not satisfied with easy answers; they examine the assumptions behind our beliefs and challenge us to justify them.
哲学一词源于希腊语 "philo"（爱）和 "sophia"（智慧），字面意思是“爱智慧”。它是对存在、知识、价值、理性、心灵和语言等根本问题的理性探究。与严重依赖实验的科学不同，哲学通过逻辑论证、思想实验和概念分析向前推进。哲学家不满足于简单的答案；他们审视我们信念背后的假设，并促使我们去为信念辩护。
At KS3, you will encounter questions such as: 'What is real?', 'How do we know what we know?', 'What is the right thing to do?', and 'What makes me the same person over time?' These questions may not have definitive answers, but the process of reasoning about them develops valuable intellectual habits.
在 KS3 阶段，你将遇到诸如“什么是真实？”、“我们如何知道我们所知道的？”、“怎样做才是对的？”以及“是什么让我在不同时间仍是同一个人？”等问题。这些问题也许没有确切的答案，但围绕它们进行推理的过程能够培养宝贵的思维习惯。
2. Branches of Philosophy | 哲学的分支
Philosophy is traditionally divided into several main branches, each focusing on a different set of questions.
哲学传统上被划分为若干主要分支，每个分支关注一组不同的问题。
Metaphysics asks: 'What is there?' It explores the nature of reality, including the concepts of time, space, causation, free will, and the existence of God. For example, is reality purely physical, or does it include non-physical things like minds or numbers?
形而上学问：“存在什么？”它探索现实的本质，包括时间、空间、因果、自由意志以及上帝存在等概念。例如，现实是纯粹物理的，还是包含了像心灵或数字这样的非物理事物？
Epistemology asks: 'How do we know?' It studies knowledge, belief, justification, and truth. A central topic is the definition of knowledge and the limits of what we can know.
认识论问：“我们如何知道？”它研究知识、信念、辩护和真理。一个核心议题是知识的定义以及我们认知的界限。
Ethics asks: 'How should we act?' This branch examines moral values, right and wrong, and the principles that guide our actions. Key theories include utilitarianism, deontology, and virtue ethics.
伦理学问：“我们应该如何行动？”这个分支考察道德价值、对与错，以及指导我们行为的原则。主要理论包括功利主义、道义论和美德伦理。
Logic is the study of correct reasoning. It provides tools for constructing sound arguments and identifying fallacies. Other branches include Aesthetics (beauty and art) and Political Philosophy (justice, rights, and the state). Each branch helps us think more clearly about different aspects of human life.
逻辑学研究正确推理。它提供构建可靠论证和识别谬误的工具。其他分支还包括美学（美与艺术）和政治哲学（正义、权利与国家）。每个分支都帮助我们更清晰地思考人类生活的不同面向。
3. Epistemology: What is Knowledge? | 认识论：什么是知识？
For centuries, philosophers have attempted to define knowledge. The traditional analysis, known as the JTB (Justified True Belief) account, states that a person S knows a proposition P if and only if:
几个世纪以来，哲学家一直试图定义知识。传统的分析被称为 JTB（得到辩护的真信念）说明，它指出一个人 S 知道命题 P 当且仅当：
(1) P is true. (Truth condition)
(1) P 是真的。（真条件）
(2) S believes that P. (Belief condition)
(2) S 相信 P。（信念条件）
(3) S is justified in believing that P. (Justification condition)
(3) S 有理由相信 P。（辩护条件）
For example, if you know that Paris is the capital of France, it is because Paris is indeed the capital (truth), you believe it, and you have good reasons to believe it (such as having learned it from reliable sources). Justification is what distinguishes knowledge from lucky guesses.
例如，如果你知道巴黎是法国的首都，那是因为巴黎确实就是首都（真），你相信这一点，并且你有充分的理由相信它（例如从可靠来源获悉）。辩护是区分知识与运气猜测的关键。
4. The Gettier Problem | 盖梯尔问题
In 1963, the philosopher Edmund Gettier published a short paper that shook the JTB definition. He constructed cases where all three conditions are satisfied, yet we intuitively feel that the person does not possess knowledge. These are called Gettier cases.
1963 年，哲学家埃德蒙·盖梯尔发表了一篇短文，动摇了 JTB 定义。他构建了一些三个条件全部满足、但我们在直觉上却觉得此人并不拥有知识的案例。这些被称为盖梯尔案例。
Consider a clock that stopped exactly 24 hours ago. At noon you glance at it, and it shows 12:00. Unaware that it is broken, you form the belief that it is 12:00. As it happens, it actually is 12:00. Your belief is true and you have good reason to trust a working clock, so it appears justified. Yet we would not say you know the time, because your justification depends on a faulty clock. The belief is true merely by luck. This shows that JTB may be necessary but not sufficient for knowledge, provoking decades of epistemological debate.
设想有一只钟表恰好在 24 小时前停了。正午时分你瞥了一眼，它显示 12:00。你不知道它是坏的，便形成了“现在是 12:00”的信念。而实际上此刻确实是 12:00。你的信念为真，而且你有理由相信一只正常运行的钟，因此看似得到了辩护。然而我们不会说你知道了时间，因为你的辩护依赖于一只坏钟。这个信念只是由于运气才成真。这表明 JTB 可能是知识的必要条件，但不是充分条件，从而引发了数十年的认识论争论。
5. Ethics: How Should We Live? | 伦理学：我们应该如何生活？
Ethics, or moral philosophy, is concerned with how we ought to behave and why. It does not merely describe what people do (that is sociology), but prescribes what they should do. Three major normative ethical theories provide different frameworks for answering moral questions.
伦理学，即道德哲学，关注我们应该如何行为以及为什么。它不仅仅描述人们做了什么（那是社会学），而且规定人们应该做什么。三大规范伦理理论为回答道德问题提供了不同的框架。
Consequentialism judges actions solely by their outcomes. The most famous consequentialist theory is utilitarianism, which claims that the morally right action is the one that produces the greatest overall happiness. Deontology, by contrast, insists that some actions are right or wrong in themselves, regardless of consequences. Virtue ethics shifts the focus from actions to the character of the moral agent, asking what a virtuous person would do. These theories will be explored in more detail in the following sections.
后果论仅仅根据结果来评判行为。最著名的后果论理论是功利主义，它主张道德上正确的行为是能产生最大总体幸福的行为。相反，道义论坚持认为某些行为本身就是对的或错的，无论后果如何。美德伦理则将焦点从行为转向道德主体的品格，追问一个有德性的人会怎么做。这些理论将在接下来的小节中详细探讨。
6. Utilitarianism vs. Deontology | 功利主义与道义论
Utilitarianism was first systematically developed by Jeremy Bentham (1748–1832) and later refined by John Stuart Mill (1806–1873). Bentham proposed a 'hedonic calculus' to measure pleasure and pain, arguing that all actions should be evaluated by their tendency to maximise pleasure and minimise pain for everyone affected. Mill introduced a distinction between higher and lower pleasures, arguing that intellectual pleasures are superior to bodily ones. The core principle remains: 'the greatest happiness for the greatest number'.
功利主义最早由杰里米·边沁系统发展，后经约翰·斯图尔特·密尔完善。边沁提出了一套“快乐计算法”来衡量快乐与痛苦，主张所有行为都应根据其为所有受影响者最大化快乐、最小化痛苦的倾向来评价。密尔引入了高级快乐与低级快乐的区分，认为理智的快乐优于肉体的快乐。其核心原则依然是“为最大多数人谋最大幸福”。
Deontology is most closely associated with Immanuel Kant (1724–1804). Kant argued that moral duties are absolute and derive from reason. His 'categorical imperative' has several formulations, including: 'Act only according to that maxim whereby you can at the same time will that it should become a universal law', and 'Act in such a way that you treat humanity, whether in your own person or in the person of another, always as an end and never merely as a means.' For Kant, lying is always wrong, even if it could save a life, because a universal law permitting lying would undermine trust and communication. This illustrates the sharp contrast between calculating consequences and respecting moral rules.
道义论与伊曼努尔·康德最为相关。康德认为道德义务是绝对的，源于理性。他的“绝对命令”有若干表述，其中包括：“只按照你同时能够意愿它成为一条普遍法则的准则去行动”，以及“你要这样行动，永远都把你人格中的人性以及每个他人人格中的人性同时用作目的，而决不只是用作手段。”对康德来说，撒谎永远是错的，即使能挽救生命，因为允许撒谎的普遍法则会摧毁信任与沟通。这凸显了计算后果与尊重道德规则之间的鲜明对比。
7. The Trolley Problem | 电车难题
The trolley problem is a thought experiment designed to test our moral intuitions. Imagine a runaway trolley speeding down a track towards five people who are tied up and unable to move. You are standing beside a lever. If you pull it, the trolley will switch to a side track where only one person is tied. You have two options: do nothing and let five die, or pull the lever, saving five but causing the death of one. Is it morally permissible to pull the lever?
电车难题是一个旨在检验我们道德直觉的思想实验。设想一辆失控的电车沿着轨道冲向五个被绑住、无法动弹的人。你站在一个拉杆旁边。如果拉动拉杆，电车就会转向另一条轨道，那里只绑着一个人。你有两个选择：什么也不做，让五个人死去；或者拉动拉杆，救下五人但导致一人死亡。拉动拉杆在道德上是允许的吗？
Utilitarians argue that you should pull, because saving five lives produces greater happiness. Many deontologists, however, object that actively diverting the trolley makes you directly responsible for killing the one person, violating a duty not to use someone as a mere means. A variation called the ‘footbridge case’, where you must push a large man off a bridge to stop the trolley, elicits even stronger deontological reluctance. The trolley problem remains a powerful tool for exploring the tension between outcomes and duties.
功利主义者认为应该拉动拉杆，因为拯救五个人会产生更大的幸福。然而，许多道义论者反对说，主动改变电车的方向会使你直接对杀死那一个人负责，违反了不将人仅仅当作手段的义务。还有一个被称为“天桥案例”的变体：你必须把一个胖子从桥上推下去以阻止电车，这引发了更强烈的道义论抵触。电车难题至今仍是探索后果与义务之间张力的有力工具。
8. Philosophy of Mind: Mind and Body | 心灵哲学：心与身
The mind-body problem concerns the relationship between mental phenomena (thoughts, feelings, consciousness) and the physical brain and body. Are they distinct, or is the mind simply the brain at work? Dualism is the view that mind and body are fundamentally different substances. René Descartes (1596–1650) argued that the mind is a non-extended, thinking substance, while the body is an extended, non-thinking substance. He suggested they interact in the pineal gland.
心身问题关注的是心理现象（思想、感受、意识）与物理大脑和身体之间的关系。它们是不同的，还是心灵仅仅是大脑的活动？二元论主张心灵和身体是根本不同的实体。勒内·笛卡尔论证说，心灵是非广延的、思维着的实体，而身体是广延的、非思维着的实体。他提出二者在松果腺中交互作用。
Physicalism, by contrast, claims that mental states are identical with brain states or functional processes. Advances in neuroscience show strong correlations between mental activities and neural activities, which many take as evidence for physicalism. However, explaining subjective conscious experience — the 'what it is like' to feel a pain or see red — remains a challenge, often called the 'hard problem of consciousness'. This debate invites us to ask: could a purely physical description of the brain ever fully capture what it feels like to be you?
相比之下，物理主义声称心理状态等同于大脑状态或功能过程。神经科学的进展显示了心理活动与神经活动之间强烈的相关性，许多人将此视为物理主义的证据。然而，解释主观意识体验——感到疼痛或看见红色的“感觉如何”——仍然是一个挑战，常被称为“意识难题”。这场辩论促使我们追问：一个纯粹物理的大脑描述，是否可能完全捕捉你作为你自己的那种感受？
9. Free Will and Determinism | 自由意志与决定论
A classic philosophical puzzle asks whether we genuinely have free will. Determinism is the thesis that every event, including human actions and decisions, is the inevitable result of prior causes and the laws of nature. If determinism is true, it seems that we could never have done otherwise, which casts doubt on moral responsibility. How can we blame people for actions they were predetermined to perform?
一个经典的哲学难题是：我们是否真的拥有自由意志。决定论是一种论点，认为每一个事件，包括人类的行为和决定，都是先前原因和自然法则的必然结果。如果决定论为真，我们似乎就从来不可能采取不同的行动，这便对道德责任提出了质疑。我们怎能责备人们做出那些早已被预先决定了的行为？
Libertarians in philosophy reject determinism and affirm free will, often by appealing to quantum indeterminacy or a non-physical mind. Compatibilists, however, argue that free will and determinism are compatible. They redefine free will as the ability to act according to one's own desires and intentions without external coercion — even if those desires themselves are determined by prior causes. For compatibilists, freedom is not about having an uncaused will, but about being able to do what you want. The debate remains lively in both philosophy and science.
哲学上的自由意志论者拒绝决定论，并肯定自由意志，通常诉诸量子不确定性或非物质的心灵。然而，相容论者主张自由意志与决定论可以相容。他们将自由意志重新定义为能够按照自己的欲望和意图行动而不受外部强迫——即使这些欲望本身也是由先前的原因决定的。对相容论者来说，自由不在于有一种无原因的意志，而在于能够做自己想做的事。这一辩论在哲学和科学中依然充满活力。
10. The Problem of Personal Identity | 人格同一性问题
What makes you the same person you were ten years ago, given that many of your cells have changed and your mental life has evolved? The problem of personal identity asks what, if anything, grounds the persistence of a person across time. One answer is the body theory: identity is maintained by having the same physical body and brain. This seems intuitive, but it struggles with cases of severe bodily change or brain transplantation.
既然你的许多细胞已经变化，心理生活也已演变，是什么
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