求翻译：Idiom’s definition has been divided into two parts: 1. Language of people or country, specific character of people or county. 2. (Grammar) succession of the words whose meaning are not obvious through knowledge of the individual meanings of the constituent words but must be learnt as a whole. But the scope of idioms is not fixed. In a broad sense, there are six kinds of idioms recognized, namely proverb, saying, colloquialism, allusion, and slang. Generally speaking, idiom has its own fixed collocation and could not be randomly substituted, added, or subtracted. It could be a combination of a few words, a phrase, or a complete sentence.是什么意思？

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