Xué chéngyǔ shì xué Zhōngwén hěn zhòngyào de yī bùfen.
Learning idioms is a very important part of learning Chinese.
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Most 成语 are four characters and come from ancient stories, literature, or history. There are over 30,000 成语. Common ones like 一举两得 (kill two birds with one stone) are used daily.