needle valve seat hermetic test device

例句：

1. 1.The needle valve seat was the weakest link in the system.
   针阀座是系统中最薄弱的环节。
2. 2. The hermetic test device is essential for ensuring the integrity of the sealing system.
   密封测试装置对于确保密封系统的完整性至关重要。
3. 3. The engineer used the needle valve seat to troubleshoot the leaky valve.
   工程师使用针阀座来诊断漏气的阀门。