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1.the margin of ……的边缘
I traced a huge star and three exclamation points in the margin of my notebook as he moved onto another subject.
当他换下个话题时，我在笔记本边上特意做了一个大星号和三个感叹号。
2.prey upon 掠夺，折磨；捕食
Baboons most often form close bonds with relatives, the researchers said, and the stability of those connections is partly a matter of luck since lions and leopards often prey upon baboons.
研究者表示，狒狒通常会与亲属建立亲密的关系，不过由于狮子和豹子的捕食，使得这种关系的稳定性含有一定的运气成分。
