流体

例句：

1. 1. The fluidity of the water is such that it can flow easily.
   水的流动性使得它能够轻易地流动。
2. 2. The scientist studied the properties of different types of fluids.
   这位科学家研究了不同类型流体的性质。
3. 3. The physicist used a fluid to cool down the engine.
   物理学家使用一种流体来冷却发动机。