1. Auto USD Subtotal on Expense Lines / 费用明细美元小计
When you create or edit an expense line, the module automatically computes the USD equivalent based on the expense date's exchange rate. The USD subtotal is stored and tracked, making it easy to report expenses in a globally recognized currency.
创建或编辑费用明细时，模块自动按费用日期的汇率计算美元等值金额。美元小计自动存储和跟踪，便于以全球通用货币进行报表分析。
2. Currency Rate Display / 汇率显示
The expense form displays the exchange rate between the expense currency and the company's main currency. A dynamic rate label shows the conversion clearly (e.g., "1 CNY = 0.1380 USD"), helping finance teams quickly verify rates.
费用表单显示费用币种与公司本币之间的汇率。动态汇率标签清晰展示换算关系（如"1 CNY = 0.1380 USD"），帮助财务团队快速核实汇率。
3. Sheet USD Total / 报销单美元合计
Expense sheets automatically aggregate the USD totals from all expense lines. The sheet also displays the USD exchange rate for the accounting date, providing a consolidated multi-currency view.
报销单自动汇总所有费用明细的美元合计。同时显示记账日期的美元汇率，提供统一的多币种视图。
4. Multi-Currency Compliance / 多币种合规管控
The module enforces a rule: expenses in different currencies cannot be merged into the same expense sheet. This ensures clean, auditable reports and prevents currency conversion errors during reimbursement.
模块强制规则：不同币种的费用不能合并到同一报销单。确保报销单清晰可审计，防止报销过程中的币种转换错误。
5. Multi-Company & Multi-Language / 多公司与多语言
Full multi-company support: each company's main currency is used for rate calculations. Multi-language support ensures the module works seamlessly for global teams.
完整的多公司支持：每家公司的本币用于汇率计算。多语言支持确保全球团队无缝使用。