fluid end of pump

例句：

1. 1. Thefluid flowed smoothly through the pipe.
   液体顺畅地流过管道。
2. 2. Thewater in the bottle isvery fluid.
   瓶子里的水非常流动。
3. 3. The river is a natural fluidthat moves through the landscape.
   河流是自然流动的水，穿过景观。