rappel

例句：

1. 1. The rope was too short to reach the top of the tree.
   绳子太短了，够不到树顶。
2. 2.She rappeled down the cliff with her friends.
   她和她的朋友们一起从悬崖上跳下来。
3. 3. The car's brakes were not working properly, so we had to rappel down the hill.
   汽车的刹车出了问题，所以我们不得不从山坡上滑下来。