求翻译：English Idioms have its own unique features, compared with general phrases and sentences. Fully understand and master the idiom of the translation of these features is undoubtedly important to translation. Idiom meaning is quite different from the word-for-word translation. The meaning idioms convey is non-compositional. It implies that you cannot understand the meaning of the whole phrase by just putting the meanings of each word together. English idioms have two inherent and very important features of the idiomatic expressions: semantic unity and structural stability.是什么意思？

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