test ring

例句：

1. 1. The engineer tested the new machine before it was put into use.
   工程师在机器投入使用前对其进行了测试。
2. 2.The scientist used a test ring to measure the strength of the material.
   科学家使用一个测试环来测量材料的强度。
3. 3. The company conducted a thorough test ring before releasing the product to the market.
   公司在产品投放市场前进行了彻底的测试环。