📚 Year 7 WJEC Law: Formula & Theorem Quick Reference Handbook | WJEC 七年级法律：公式定理速查手册
Welcome to your quick‑reference guide for Year 7 WJEC Law. Just like mathematics, law has its own 'formulas' and 'theorems' — structured rules and principles that help you analyse legal problems logically. This handbook brings together the most important legal building blocks: the equations that define a crime, the elements that form a binding contract, the tests for negligence, and the constitutional theorems that underpin the justice system. Keep it handy for revision, homework and classroom discussion.
欢迎使用 WJEC 七年级法律速查手册。和数学一样，法律也有自己的"公式"和"定理" — 帮助你逻辑地分析法律问题的结构化规则与原理。本手册汇集了最重要的法律基石：定义犯罪的等式、构成有效合同的要素、过失的检验标准，以及支撑司法制度的宪法定理。请随身携带，用于复习、作业和课堂讨论。
1. The Formula of a Crime: Actus Reus + Mens Rea | 犯罪公式：犯罪行为 + 犯罪意图
In criminal law, most offences can be broken down into a simple equation: Crime = Actus Reus + Mens Rea. Actus reus refers to the guilty act — the physical element of the crime, such as taking someone else's property or causing bodily harm. Mens rea is the guilty mind — the mental element, such as intention, recklessness or knowledge.
在刑法中，大多数犯罪可以分解为一个简单的等式：犯罪 = 犯罪行为 + 犯罪意图。犯罪行为是指有罪的行为 — 犯罪的客观要件，比如拿走他人财产或造成人身伤害。犯罪意图是指有罪的心理 — 主观要件，比如故意、轻率或明知。
Both elements must be present at the same time for a defendant to be found guilty. If someone accidentally knocks over a vase but had no intention to damage property, the mens rea is missing, and generally no crime has been committed (though there may be civil liability).
两个要素必须同时存在，被告才能被定罪。如果有人不小心打翻花瓶，但没有损坏财产的意图，犯罪意图就不存在，通常不构成犯罪（但可能存在民事责任）。
Exceptions exist — some crimes do not require mens rea for at least part of the offence. These are called strict liability offences, which we explore next.
也存在例外 — 某些犯罪至少部分不要求犯罪意图。这些被称为严格责任犯罪，我们接下来探讨。
2. Strict Liability: Exceptions Without Mens Rea | 严格责任：无需犯罪意图的例外
The legal theorem of strict liability states: Strict Liability Offence = Actus Reus alone (no need to prove Mens Rea for all elements). Such offences are usually regulatory or related to public safety, like speeding, selling alcohol to minors, or food hygiene breaches.
严格责任的法律定理表述为：严格责任犯罪 = 仅有犯罪行为（无需证明全部要件的犯罪意图）。这类犯罪通常是监管性的或与公共安全相关，比如超速、向未成年人售酒或违反食品卫生规定。
The rationale is that protecting the public outweighs the requirement to prove a guilty mind. Even if a shopkeeper honestly believed a customer was over 18, they can still be convicted for selling alcohol to a minor.
其理由在于保护公众比证明有罪心理更为重要。即使店主真诚相信顾客已满 18 岁，他们仍可能因向未成年人售酒而被定罪。
However, strict liability is not absolute — defendants can often raise the defence of due diligence, showing they took all reasonable steps to avoid the offence. This preserves a measure of fairness.
然而，严格责任并非绝对 — 被告通常可以提出"尽职调查"抗辩，证明他们已采取一切合理措施避免犯罪。这保留了公平性的衡量标准。
3. The Formula of a Contract: Offer + Acceptance + Consideration | 合同公式：要约 + 承诺 + 对价
A legally binding contract is formed when three core elements come together: Contract = Offer + Acceptance + Consideration. An offer is a clear expression of willingness to enter into a contract on specific terms. Acceptance is an unqualified agreement to all the terms of that offer. Consideration is the exchange of something of value — each party must give, do or promise something.
一份具有法律约束力的合同在三个核心要素齐备时成立：合同 = 要约 + 承诺 + 对价。要约是愿意按特定条款订立合同的明确表示。承诺是对要约所有条款的无条件同意。对价是有价值事物的交换 — 每一方都必须给予、做或承诺某事。
For example, if A offers to sell a bicycle for £100 (offer) and B agrees to pay that price (acceptance), the money is B's consideration and the bicycle is A's consideration. Without consideration, the agreement is merely a gift promise and usually not enforceable.
例如，如果 A 提出以 100 镑出售一辆自行车（要约），B 同意支付该价格（承诺），那么这笔钱是 B 的对价，自行车是 A 的对价。没有对价，协议仅是赠与承诺，通常不可强制执行。
Remember that an 'invitation to treat' (like goods on a shop shelf) is not an offer; it is an invitation for customers to make an offer, which the seller can accept or reject.
记住，"要约邀请"（如货架上的商品）不是要约；它是邀请顾客提出要约，卖方可以接受或拒绝。
4. Intention to Create Legal Relations: The Missing Element | 建立法律关系的意图：隐藏的要素
Alongside the three core elements, courts also require proof of an intention to create legal relations. In commercial agreements, there is a strong presumption that such intention exists. In social or domestic arrangements, the presumption is the opposite — parties are assumed not to intend legal consequences.
除三个核心要素外，法院还要求证明建立法律关系的意图。在商业协议中，有强有力的推定认为该意图存在。在社会或家庭安排中，推定则相反 — 假定当事人不打算产生法律后果。
These presumptions can be rebutted with evidence. A written agreement between friends that clearly states it is legally binding would reverse the domestic presumption. This theorem reminds us that not all promises are meant to end up in court.
这些推定可以被证据推翻。朋友之间一份明确说明具有法律约束力的书面协议会推翻家庭推定。这一定理提醒我们，并非所有承诺都打算进入法庭。
5. The Tort of Negligence: Duty + Breach + Damage | 过失侵权公式：义务 + 违反 + 损害
In civil law, the tort of negligence is defined by a three‑part formula: Negligence = Duty of Care + Breach of that Duty + Damage caused by the Breach. First, the defendant must owe the claimant a duty of care — the famous 'neighbour principle' from Donoghue v Stevenson says you must take reasonable care to avoid acts or omissions that could foreseeably harm your neighbour.
在民法中，过失侵权由一个三部分公式定义：过失 = 注意义务 + 违反该义务 + 因违反造成的损害。首先，被告必须对原告负有注意义务 — 著名的"邻居原则"来自 Donoghue v Stevenson 案，要求你采取合理注意避免可预见会伤害邻居的作为或不作为。
Second, the defendant must have breached that duty by falling below the standard of a reasonable person. Third, the breach must have caused actual damage — not too remote — for the claim to succeed.
其次，被告必须因未达到理性人标准而违反该义务。第三，该违反必须已造成实际损害 — 不能过于遥远 — 索赔才能成功。
If any one element is missing, the negligence claim fails. This structured approach helps courts decide disputes consistently.
如果任一要素缺失，过失索赔便不成立。这种结构化的方法有助于法院一致地裁决纠纷。
6. The Reasonable Person Test: A Legal Theorem | 理性人标准：法律定理
The 'reasonable person' is a hypothetical figure used throughout law — in negligence, contract interpretation, and even criminal defences like self‑defence. The test asks: what would a reasonable person have done in the same circumstances? It is an objective standard, not based on the individual defendant's personal characteristics.
"理性人"是法律中贯穿使用的一个假设形象 — 在过失、合同解释，甚至正当防卫等刑事抗辩中。该检验标准是：一个理性人在相同情况下会怎么做？这是一个客观标准，不基于被告个人的特质。
For example, in negligence, if a reasonable driver would have slowed down at a junction, but the defendant did not, they have breached their duty. The test injects consistency and fairness, preventing liability from turning on purely subjective excuses.
例如，在过失中，如果一个理性司机会在路口减速，而被告没有，那么他们就违反了义务。该检验标准注入了连贯性和公平性，防止责任完全取决于主观借口。
7. Sources of Law: Statute Law vs Common Law | 法律渊源：成文法与普通法
UK law comes from two main sources, which can be thought of as parallel streams feeding the legal system. Statute law is made by Parliament through Acts, representing the supreme law of the land. Common law (or case law) is made by judges through decisions in courts, where they interpret statutes and develop principles where no statute exists.
英国法有两个主要渊源，可被视为滋养法律体系的两条平行溪流。成文法由议会通过法案制定，是该国最高位阶的法律。普通法（或判例法）由法官在法庭判决中制定，他们解释法律并在没有成文法时发展原则。
The doctrine of parliamentary sovereignty means that statute law can override common law. However, judges still have a powerful role through precedent — the principle that like cases must be decided alike, bringing predictability to the law.
议会主权原则意味着成文法可以推翻普通法。但法官仍通过先例发挥强大作用 — 同案同判原则，为法律带来可预测性。
8. The Court Hierarchy: A Decision‑Making Flowchart | 法院等级：决策流程图
The English court structure can be understood as a flowchart where decisions flow both upwards on appeal and downwards through precedent. At the base are Magistrates' Courts and County Courts; above them the Crown Court and High Court; then the Court of Appeal; and finally the Supreme Court. Each level is bound by the decisions of courts above it in the hierarchy.
英格兰法院结构可理解为一个流程图，裁决通过上诉向上流动，又通过先例向下流动。基层是治安法院和郡法院；其上是刑事法院和高等法院；然后是上诉法院；最后是最高法院。每一级都受其上一级法院判决的约束。
The Supreme Court is the highest authority, and its rulings must be followed by all lower courts. However, since 1966, the Supreme Court can depart from its own previous decisions 'when it appears right to do so', introducing flexibility at the top.
最高法院是最高权威，其裁决必须被所有下级法院遵循。然而，自 1966 年起，最高法院可以在"认为正确时"背离自己先前的判决，为顶层引入了灵活性。
9. Presumption of Innocence: 'Innocent Until Proven Guilty' | 无罪推定："无罪推定"原则
This fundamental criminal law theorem states: A person is innocent until proven guilty beyond reasonable doubt. The burden of proof lies on the prosecution, not the defendant. It is a right protected by Article 6 of the European Convention on Human Rights and embedded in common law.
这一基本刑法定理表述为：一个人在经证明超出合理怀疑有罪之前是无罪的。证明责任在控方，而非被告。这是《欧洲人权公约》第 6 条保护的权利，并植根于普通法。
The standard of proof in criminal cases is 'beyond reasonable doubt' — a much higher threshold than the civil standard of 'on the balance of probabilities'. This reflects the seriousness of criminal sanctions, such as loss of liberty.
刑事案件的证明标准是"超出合理怀疑" — 比民事"可能性权衡"标准高得多。这反映了刑事制裁（如丧失自由）的严重性。
Some statutes reverse the burden for specific issues (e.g., a defendant claiming a licence must prove it), but the core principle remains: the state must prove guilt.
有些法律对特定问题倒置证明责任（如被告声称持有许可证必须证明之），但核心原则不变：国家必须证明罪责。
10. The Separation of Powers: A Constitutional Theorem | 权力分立：宪法定理
The separation of powers is a constitutional model that divides state authority into three branches: the legislature (Parliament) makes law, the executive (government) implements law, and the judiciary (courts) interprets and applies law. Each branch acts as a check on the others to prevent concentration of power.
权力分立是一种宪法模式，将国家权力划分为三个分支：立法机关（议会）制定法律，行政机关（政府）执行法律，司法机关（法院）解释和适用法律。每个分支对其他分支形成制衡，防止权力集中。
In the UK, the separation is not absolute — government ministers are also members of Parliament — but the Constitutional Reform Act 2005 strengthened judicial independence by creating the Supreme Court and reforming the role of the Lord Chancellor. This theorem underpins the rule of law.
在英国，分立并不绝对 — 政府大臣同时是议会议员 — 但 2005 年《宪制改革法》通过设立最高法院并改革大法官职能加强了司法独立。这一定理支撑着法治。
11. Legal Reasoning with IRAC: A Problem‑Solving Formula | 法律推理 IRAC：解题公式
When tackling a legal problem question, students can use the IRAC formula: Issue, Rule, Application, Conclusion. First, identify the legal issue. Second, state the relevant rule (the formula or theorem from this handbook). Third, apply the rule to the facts. Finally, reach a reasoned conclusion.
在处理法律问题题时，学生可以使用IRAC 公式：问题、规则、应用、结论。首先，识别法律问题。其次，陈述相关规则（本手册中的公式或定理）。第三，将规则应用于事实。最后，得出有理有据的结论。
For example, if asked whether a contract existed, you would frame the issue, set out Offer + Acceptance + Consideration + Intention, apply each element to the scenario, and decide. This structured method mirrors how lawyers analyse cases and is excellent for exam success.
例如，如果被问及合同是否存在，你将构建问题，列出要约 + 承诺 + 对价 + 意图，将每个要素应用于场景，然后做出判断。这种结构化方法反映了律师分析案件的方式，极有助于考试成功。
12. Ratio Decidendi vs Obiter Dicta: The Binding Theorem | 判决理由与附带意见：有约束力的定理
In common law, not everything a judge says in a judgment is binding. Only the ratio decidendi — the legal principle necessary for the decision — creates a precedent that lower courts must follow. Obiter dicta are remarks made 'by the way', which are persuasive but not binding.
在普通法中，法官在判决书中说的并非全都有约束力。只有判决理由 — 作出裁决所必需的法律原则 — 才创设有约束力的先例，下级法院必须遵循。附带意见是"顺带"发表的言论，具有说服力但不具约束力。
Distinguishing ratio from obiter is a key skill. When reading a case, ask: was this statement essential to solving the dispute? If yes, it forms the ratio. This theorem maintains order in the precedent system.
区分判决理由与附带意见是一项关键技能。阅读案例时，问一问：这一陈述对解决争议是否必不可少？若是，则构成判决理由。这一定理维持了先例制度的秩序。
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