top-down testing

例句：

1. 1. In the software development process, top-down testing is used to ensure that the system meets therequirements from the top down.
   在软件开发过程中，使用自上而下测试以确保系统从上到下满足需求。
2. 2. The top-down testing method involves testing the entire system from the top layer down to the lowest level.
   自上而下测试方法涉及从顶层向下至最低层进行整个系统的测试。
3. 3. Top-down testing is an effective way to identify and fix issues before they become major problems.
   自上而下测试是一种有效的方式来识别和解决在变成重大问题之前的问题。