📚 Year 9 CAIE Accounting: Core Knowledge Review | Year 9 CAIE 会计：核心知识点梳理
Welcome to this comprehensive revision guide for Year 9 CAIE Accounting. This article covers the essential topics you need to master, from the basic accounting equation to preparing financial statements. Whether you are new to accounting or reviewing for an exam, these core concepts will build a strong foundation.
欢迎阅读这份 Year 9 CAIE 会计综合复习指南。本文涵盖你需要掌握的核心主题，从基本会计等式到编制财务报表。无论你是初次接触会计还是备考复习，这些核心概念都将为你奠定坚实的基础。
1. What is Accounting? | 什么是会计？
Accounting is a systematic process of identifying, recording, measuring, classifying, verifying, summarising, interpreting, and communicating financial information. It reveals the profit or loss for a given period and the value and nature of a firm's assets, liabilities, and owner's equity.
会计是一个系统化的过程，包括识别、记录、计量、分类、核实、汇总、解释和传达财务信息。它揭示了企业在一定期间的利润或亏损，以及企业资产、负债和业主权益的价值和性质。
The primary objective of accounting is to provide useful information to decision-makers, such as owners, managers, investors, and creditors. It helps them assess the business's performance and make informed choices.
会计的主要目标是为决策者（如业主、管理者、投资者和债权人）提供有用的信息。它帮助他们评估企业的业绩并做出明智的选择。
There are two main branches: financial accounting, which focuses on external reporting for stakeholders outside the business, and management accounting, which serves internal decision-making. At Year 9 level, we concentrate on financial accounting.
会计主要有两个分支：财务会计侧重于为企业外部的利益相关者编制报告，管理会计服务于内部决策。在九年级阶段，我们重点学习财务会计。
2. The Accounting Equation | 会计等式
The accounting equation is the foundation of the double-entry system. It states that a company's total assets are always equal to the sum of its liabilities and owner's equity. This equation must remain in balance after every transaction.
会计等式是复式记账系统的基础。它表明公司的总资产始终等于其负债与业主权益之和。该等式在每笔交易后都必须保持平衡。
Assets = Liabilities + Owner's Equity
Assets are resources owned by the business (e.g., cash, inventory, equipment, premises). Liabilities are amounts owed to outsiders (e.g., bank loans, trade payables). Owner's equity represents the owner's residual interest in the business, which equals capital introduced plus profits retained less any drawings.
资产是企业拥有的资源（例如现金、存货、设备、房产）。负债是欠外部方的款项（例如银行贷款、应付账款）。业主权益代表业主在企业中的剩余权益，等于投入的资本加上留存的利润减去任何提款。
Every financial transaction affects at least two elements of this equation. For instance, if the owner injects $5,000 cash, assets (cash) increase by $5,000 and owner's equity (capital) increases by $5,000, keeping the equation balanced.
每笔财务交易至少影响该等式中的两个要素。例如，如果业主投入 5,000 美元现金，资产（现金）增加 5,000 美元，业主权益（资本）增加 5,000 美元，等式保持平衡。
3. Double-Entry Bookkeeping | 复式记账法
Double-entry bookkeeping is based on the principle that every financial transaction has equal and opposite effects in at least two different accounts. For every debit entry, there must be a corresponding credit entry of the same amount. This system ensures the accounting equation remains balanced.
复式记账法的原则是，每一笔财务交易至少会在两个不同的账户中产生金额相等、方向相反的影响。对于每一笔借方分录，必须有一笔等额的贷方分录。该系统确保会计等式始终保持平衡。
Total Debits = Total Credits
Debits (abbreviated as Dr) are recorded on the left side of an account; credits (Cr) are on the right. The rules of double-entry: increases in assets and expenses are debited; increases in liabilities, owner's equity, and revenue are credited. Decreases do the opposite.
借方（缩写为 Dr）记在账户的左侧；贷方（Cr）记在右侧。复式记账的规则是：资产和费用的增加记入借方；负债、业主权益和收入的增加记入贷方。减少则做相反记录。
For example, if a business buys office furniture for $800 cash, it debits Furniture (asset increases) and credits Cash (asset decreases). If it makes a credit sale of $300, it debits Trade Receivables and credits Sales revenue.
例如，如果企业用现金购买 800 美元的办公家具，它会借记家具（资产增加），贷记现金（资产减少）。如果进行了一笔 300 美元的赊销，它会借记应收账款，贷记销售收入。
4. Source Documents | 原始凭证
Source documents are the original records that provide verifiable evidence of financial transactions. They are issued at the time a transaction occurs and are used to enter data into the accounting system. No entry should be made without a source document.
原始凭证是提供可验证的财务交易证据的原始记录。它们在交易发生时出具，并用于将数据录入会计系统。没有原始凭证，不得做任何分录。
Common source documents include: invoices (issued for credit sales of goods), receipts (proof of cash received), credit notes (reduce amounts owed, e.g., for returned goods), debit notes (request a credit note), cheque stubs, and bank statements.
常见的原始凭证包括：发票（为赊销货物开具）、收据（现金收款的证明）、贷记通知单（减少欠款金额，如因退货）、借记通知单（请求对方开具贷记通知单）、支票存根和银行对账单。
These documents must show key details: date of transaction, names of the buyer and seller, description of the goods or service, quantity, unit price, total amount, and any applicable tax. They serve as an audit trail.
这些凭证必须显示关键细节：交易日期、买方和卖方名称、商品或服务的描述、数量、单价、总金额以及适用的税费。它们构成了审计线索。
5. Books of Prime Entry | 原始分录账簿
Transactions are not recorded directly in the ledger. Instead, they are first entered in books of prime entry (also called books of original entry or subsidiary books). These books summarise similar types of transactions and reduce the number of entries in the ledger.
交易并不直接记入分类账。相反，它们首先记入原始分录账簿中（也称为原始账簿或辅助账簿）。这些账簿汇总了类似类型的交易，减少了分类账中的分录数量。
Key books of prime entry include: the Sales Journal (records credit sales), the Purchases Journal (records credit purchases of goods), the Returns Inwards Journal (sales returns), the Returns Outwards Journal (purchase returns), the Cash Book (records
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