成语就是一个短语或俗语，它含有很深的意义。
凡符合多数人的成语语感的短语就是成语。
A phrase, according with the majority's feel for idioms, is an idiom.
在词汇习得研究中，词汇既指单词，也指短语、成语等语段。
In vocabulary acquisition researches, vocabulary does not only refer to single words but also the "chunks" such as phrases and idioms.
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