fluid mud

例句：

1. 1. The water in the river is very fluid.
   河里的水非常流动。
2. 2. The oil is a fluid that can be poured easily.
   油是一种可以轻易倾倒的流体。
3. 3. The mixture was too fluid to pour into the pot.
   混合物太流动了，无法倒入锅中。