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Define the following terms.idioms nominal in nature
【正确答案】：

IDIOMS NOMINAL IN NATURE HAVE A NOUN AS THE KEY WORD IN EACH AND FUNCTION AS A NOUN IN SENTENCES.

【题目解析】：本题考查名词性习语。名词性习语在本质上以名词（a noun）为关键词（the key word），在句子中（in sentences）起名词的作用（function）。