invoice copying book

例句：

1. 1. We need to keep track of all the expenses for our project.
   我们需要跟踪所有项目的支出。
2. 2. The company's financial report revealed a significant increase in revenue.
   公司的财务报告显示收入显著增加。
3. 3. The invoice copying book is essential for keeping track of expenses and generating invoices.
   发票复印本是记录支出和生成发票所必需的。