safety joint for drill stem test

例句：

1. 1.The engineer used a safety joint to connect the pipes together.
   工程师使用一个安全接头将管道连接在一起。
2. 2. The construction crew made sure all safety joints were properly secured before starting work.
   施工队在开始工作前确保所有安全接头都正确固定。
3. 3. The manufacturer recommends using a safety joint when installing new equipment.
   制造商建议在使用新设备时使用安全接头。