flow laver

例句：

1. 1.The flow laver beneath the riverbed is crucial for maintaining water quality.
   河床下的流动层对于保持水质至关重要。
2. 2. The engineers used a special material to create a flow laver that could withstand high pressure.
   工程师们使用了一种特殊材料来创建一个可以承受高压的流动层。
3. 3. The flow laver plays a vital role in the transportation of materials through the underground pipeline system.
   流动层在地下管道系统中输送材料的过程中起着至关重要的作用。