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When (you are) in doubt, please consult a dictionary.
有疑问的时候，就请查字典。
youdao
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If you have no idea about it, consult a dictionary, please.
要是你对这个问题不清楚，请你查字典得了。
《新英汉大辞典》
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If you have no idea about it, consult a dictionary, please.
要是你对这个问题不清楚，请你查字典得了。
《新英汉大辞典》