airtightness test

例句：

1. 1. The engineer conducted an airtightness test on the new door.
   工程师对新门进行了密封性测试。
2. 2.Before we can use the new machine, we need to perform an airtightness test.
   在使用这台新机器之前，我们需要进行一次密封性测试。
3. 3. The manufacturer insisted that the product be tested for airtightness before it was released.
   制造商坚持在产品发布前对其进行密封性测试。