fluid end

例句：

1. 1. Thefluidity of the water allows it toflow easily.
   水的流动性使它能够顺畅流动。
2. 2.The scientist studied the properties of various fluids.
   这位科学家研究了各种流体的性质。
3. 3.The oil is a good example of afluid that expands when heated.
   油是一个很好的例子，说明当加热时会膨胀的流体。