商务英文翻译
问题描述：
商务英文翻译
Revenue: Result from the sales of products or service for a period of time.
Expense: Costs incurred to generate revenues for a period of time.
答
收入：来源于一段时间内的产品或服务销售
费用：一段时间内为产生收入而发生的成本请问incur为什么要加ed？costs incurred = costs that have been incurred,我是这样理解的，不知对否