fluid director

例句：

1. 1. The fluidity of the water allows it to flow easily.
   水的流动性让它容易流动。
2. 2. The liquidity of oil makes it easy to transport.
   油的流动性使它易于运输。
3. 3. The chemical properties of a fluid are determined by its molecular structure.
   流体的化学性质由其分子结构决定。