如果没有必要，你最好不要查字典。
Unless(it is)necessary, you'd better not refer to the dictionary.
阅读文章的时候你最好不要查每一个词都查字典。
You'd better not look up every word in the dictionary while you are reading the articles.
阅读文章的时候你最好不要查每一个词都查字典。
You'd better not look up every word in the dictionary while you are reading the articles.
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