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重点讲解：
1. stay away from 远离；
Children must be warned to stay away from main roads.
必须警告孩子们远离交通要道。
2. at the risk of 冒着…危险;担着…的风险；
He was determined to find out the truth even at the risk of his life.
他决心查出真相，虽冒生命危险在所不惜。
3. care for 照料；照顾；护理；
His natural mother was unable to care for him so he was raised by an aunt.
他的生母不能照顾他，所以他是姑姑抚养大的。
4. depend on 取决于；根据；由…决定；
Whether we need more food depends on how many people turn up.
我们是否需要更多的食物，这要视到场人数而定。
n. 相互作用，相互影响，互动交流
