downstream slope

• 背水坡

downstream slope的用法和样例：

例句

1. The skiff rises to the crest of the swell, crosses it, rides down the long hill of water behind, advances up the next slope.
   小船冲上了浪峰，越过去，顺着后面的水坡滑了下去，然后再爬上下一个坡。