by-pass damper

例句：

1. 1. The by-pass valve is used to divert water from the main line to the drain.
   旁路阀门用于将水从主管道引向排水口。
2. 2.The engineers designed a by-pass damper to improve the flow rate of the cooling system.
   工程师们设计了一个旁路阀门来提高冷却系统的流速。
3. 3.The by-pass damper was installed to prevent the main pipe from being damaged during heavy rain.
   旁路阀门被安装来防止在大雨中损坏主要管道。