back shunt

例句：

1. 1. The engineer designed a backshunt to improve the efficiency of thecooling system.
   工程师设计了一个反向抽气装置来提高冷却系统的效率。
2. 2. During theconstruction, it was necessary to back-shunt the pipes to avoid leaks.
   在施工过程中，需要反向抽气管道以避免泄漏。
3. 3. The back shunteffectively reduced the noise level in the factoryarea.
   反向抽气有效地降低了工厂区域的噪音水平。