📚 Year 10 OCR Law: Quick Reference Formulas and Rules | Year 10 OCR 法律：公式定理速查手册
The OCR Year 10 Law syllabus introduces you to the essentials of the English legal system, criminal law and civil wrongs. This Quick Reference Handbook recasts key legal tests and principles as 'formulas' to help you memorise the building blocks of offences and civil claims. Master these equations, and you will have a reliable framework for tackling exam questions with confidence.
OCR 十年级法律大纲带你走进英国法律体系、刑法和民事过错的基础世界。这份速查手册将关键的法律测试和原则转化为“公式”，帮助你记住犯罪与民事索赔的构成要件。掌握这些等式，你就能建立起自信应对考试的坚实框架。
1. The Core Equation of Criminal Liability | 刑事责任核心公式
In criminal law, liability is nearly always built on a simple equation: the prosecution must prove the actus reus (guilty act) and the mens rea (guilty mind), and the defendant must not succeed with any defence. If any one of these elements is missing, there can be no conviction.
在刑法中，责任几乎总是建立在一个简单的等式之上：控方必须证明犯罪行为与犯罪意图，且被告不能成功主张任何抗辩。如果缺少其中任何一个要素，便不能定罪。
Actus Reus + Mens Rea − Defence → Guilt
This equation applies to the vast majority of offences, but there are notable exceptions, such as strict liability crimes, that we will examine later.
这个等式适用于绝大多数犯罪，但也有一些值得注意的例外，如严格责任犯罪，我们稍后会分析。
2. The Actus Reus Formula | 犯罪行为公式
The actus reus can be a positive act, an omission (failure to act), or a state of affairs. For result crimes, the act must cause the prohibited consequence. An omission will only constitute actus reus if the defendant was under a legal duty to act – for example, by statute, by contract, by a special relationship, or because they created a dangerous situation – and failed to do so.
犯罪行为可以是积极动作、不作为（未履行义务）或某种状态。对于结果犯，行为必须造成了被禁止的后果。不作为只有在被告负有法定的作为义务（例如成文法、合同、特殊关系或制造了危险情势所产生的义务）且未履行时，才构成犯罪行为。
AR = Voluntary act / Omission (where duty exists) + Consequence (if result crime)
For example, in murder the AR is the unlawful killing of a human being. In theft, the AR is the appropriation of property belonging to another.
例如，谋杀罪的犯罪行为是非法剥夺他人生命。盗窃罪的犯罪行为是侵占属于他人的财产。
3. The Mens Rea Formula | 犯罪意图公式
Mens rea refers to the mental element of an offence. The two main types are intention (direct and oblique) and recklessness. Under the case of R v Woollin, oblique intention exists where the consequence was a virtual certainty of the defendant’s actions and the defendant appreciated that. Recklessness was redefined in R v G as being aware of an unreasonable risk and unreasonably deciding to take it.
犯罪意图指犯罪的内心要素。两种主要类型是故意（直接故意与间接故意）和轻率。根据 R v Woollin 案，当后果是被告行为的必然结果且被告意识到这一点时，即存在间接故意。轻率在 R v G 案中被重新界定为意识到不合理的风险却轻率地决定冒此风险。
MR = Intention (direct / oblique) OR Recklessness (awareness of an unreasonable risk)
Some crimes, such as murder, require proof of intention, while for others, such as criminal damage, recklessness will suffice.
有些犯罪（如谋杀）要求证明为故意，而另一些（如刑事毁坏）则只需轻率即可。
4. Strict Liability – Liability Without Mens Rea | 严格责任 – 无需意图的责任
Strict liability offences do not require proof of mens rea for at least part of the actus reus. Common examples include driving offences, food hygiene breaches, and the sale of unsafe products. The purpose of strict liability is to encourage higher standards of care by making it easier to convict. The common law presumption that mens rea is required can be displaced by clear statutory wording.
严格责任犯罪对犯罪行为中至少部分要素不要求证明犯罪意图。常见例子包括交通违规、食品卫生违法、销售不安全产品等。严格责任的目的在于通过降低定罪难度来鼓励更高的注意标准。普通法上要求犯罪意图的推定可以通过成文法的明确措辞予以推翻。
Strict Liability = AR only — No MR needed for some or all elements
Depending on the statute, a defendant may be able to raise a due diligence defence, showing they took all reasonable steps to avoid the offence.
根据成文法的规定，被告有时可以提出尽到应尽之责的抗辩，证明自己已采取一切合理步骤以避免犯罪。
5. Causation – Linking the Act to the Consequence | 因果关系 – 连接行为与结果
In result crimes, the prosecution must prove both factual and legal causation. Factual causation uses the 'but for' test: but for the defendant’s conduct, would the harm have happened? If the answer is 'no', factual causation is established. Legal causation requires that the defendant’s act was a substantial and operating cause of the harm, and that there was no novus actus interveniens (new intervening act) that broke the chain of causation.
在结果犯中，控方必须同时证明事实因果关系和法律因果关系。事实因果关系采用“若无则不”测试：若无被告的行为，损害会发生吗？若回答为“不会”，则事实因果关系成立。法律因果关系要求被告的行为是损害的重大且有效的致因，并且没有打破因果链的新的介入行为。
Causation = 'But for' test + Substantial & operative cause − Novus actus interveniens
A powerful illustration is R v Pagett: the defendant used his pregnant girlfriend as a human shield during a police shootout. The police returned fire and killed her. The court held the defendant’s act was the legal cause of death because the police’s action was not a free, deliberate and informed intervention.
一个有力的例证是 R v Pagett 案：被告在警匪枪战中用怀孕女友作人盾，警方还击并将其射杀。法院认定被告的行为是死亡的法律原因，
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