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1.at risk 处于危险中
Your child is at risk of getting one of these infections while waiting for the next injection.
你的孩子在等待下一次接种的时候，就会有感染这些传染病的危险。
2.last for 持续；延续
Then the strike will last for ever.
那么这场罢工会永远持续下去的。
3.arrive on the scene 露面；登场
Wyatt is about to shoot Mahone when police arrive on the scene.
怀亚特正想拔枪射向马宏时，警察到达了现场。
4.prey upon of 掠夺；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。
