【題目】我們很有必要了解下如何預(yù)防它。

________________________________________________

【答案】It's very necessary for us to know how to prevent it.

【解析】

表示“做某事很有必要”用it is very necessary for sb. to do；it是形式主語，真正的主語是動詞不定式“了解下如何預(yù)防它”。介詞for后面用人稱代詞的賓格us，動詞“了解”用know，賓語是“如何預(yù)防它”用“疑問詞+動詞不定式”的結(jié)構(gòu)，此處用how to prevent it。故答案為It's very necessary for us to know how to prevent it.

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