1.descendant 后裔,子孙
These adaptations served their descendant well as they invaded land.
这些适应机制在它们的后代进化成陆生生物时起了很好的协助作用
2.be made up of 由……所组成
The shape can be made up of lines, polygons, and curves.
该形状可由直线、多边形和曲线组成
3.impose 强加
Congress can impose strict conditions on the bank.
国会可能会迫使这家银行接受苛刻的条件
4.muck in 一起干活
If we all muck in we'll soon finish the work.
如果我们大家都参加进去,很快就能完成这项工作