crest of weir

例句：

1. 1.The crest of the mountain is visible from here.
   从这儿可以看到山顶。
2. 2. The crest of the wave was a sign of danger.
   海浪的顶端是危险的标志。
3. 3. The crest of the hill marks the end of the forest.
   山丘的顶端标志着森林的尽头。