... give out/give away/give up/give in/give off /give back 分发/送人/放弃/屈服/释放气体/归还 learn/know sth by heart 背诵，牢记在心 help oneself to sth/cannot help doing sth/cannot help to do sth 随便吃/禁不住做某事/不能帮忙做某事 ..
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to know sth by heart 滚瓜烂熟
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