critical test

例句：

1. 1. The company conducteda critical test of its new product beforereleasing it to the market.
   该公司在将新产品推向市场之前，对其进行了关键的测试。
2. 2. The scientist performed a critical test onthe sample to determine its composition.
   科学家对样本进行了关键测试，以确定其成分。
3. 3. The engineer conducted a critical test toensure the safety of the new machine beforeit was put into operation.
   工程师对新机器进行了关键测试，以确保其在投入运行前的安全性。