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重点讲解：
1. eavesdrop on 偷听；窃听；
例句：It is not polite to eavesdrop on the conversation of other people.
偷听他人说话是很不礼貌的。
2. hold up 维持；保持良好；
例句：Children's wear is one area that is holding up well in the recession.
童装是经济衰退中仍然保持良好发展的一个领域。
3. as for 至于…；
例句：As for his job — well, he was very mysterious about it.
至于他的工作，他总是显得非常神秘，从不多说。
4. interact with 相互作用；相互影响；
例句：Atoms within the fluid interact with the minerals that form the grains.
液体中的原子与形成颗粒的矿物质相互作用。
n. 分子
