positive double-lip seal

例句：

1. 1. The double-lip sealis used to prevent leakage during theassembly process.
   双唇密封用于在组装过程中防止泄漏。
2. 2. The positive pressure double-lip seal is a crucial component in theoil well safety system.
   正压双唇密封是油井安全系统的关键部件。
3. 3.The engineer carefully inspected the double-lip seal before installing it on the machine.
   工程师在安装机器之前仔细检查了双唇密封。