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道别
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在公共汽车上
1. 顺道拜访;突然拜访If you drop in on someone, you visit them informally, usually without having arranged it.
1. visit informally and spontaneously
e.g. We frequently drop by the neighbors' house for a cup of coffee
Synonym: drop bycome by
多通过句子记忆单词，而不是单独死记硬背。
