fluid dirt level

例句：

1. 1. The water in the bottle isfluid.
   瓶子里的水是流动的。
2. 2. Theoil flowed freely from the tap.
   油从水龙头里自由地流出来。
3. 3. Theriver was squirting waterover the rocks.
   河水从岩石上喷涌而出。