descent

n.

1. 下降, 降下; 沦落
   • We watched anxiously during her descent from the tree.
     我们焦急地看着她从树上爬下来。
2. 下坡
   • The descent of the mountain took two hours.
     下山花了两个小时。
3. 血统, 出身, 门第
   • She is of German descent.
     她祖籍是德国。