pump casing cover

例句：

1. 1. The pump casingcover was damaged during the installation process.
   在安装过程中，泵壳盖受损了。
2. 2.The pump casing cover is essentialfor maintaining the proper functioning of thepump.
   泵壳盖对于保持泵的正常运作至关重要。
3. 3. The pump casing coverneeds to be replaced after a certain periodof use to prevent damage.
   在使用一段时间后，需要更换泵壳盖以防止损坏。