testing system flexibility

例句：

1. 1. The engineer is conducting a thorough testing of the new machine.
   工程师正在对新机器进行彻底的测试。
2. 2.The teacher asked the students to do some testing before the exam.
   老师要求学生们在考试前做一些测试。
3. 3. The company conducted rigorous testing to ensure the product's quality.
   公司进行了严格的测试，以确保产品的质量。