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1·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》

2·I need to consult a dictionary.

我需要查字典。

3·Do you often consult a dictionary?

你经常查阅字典吗？

4·E : Do you often consult a dictionary?

你经常查阅字典吗？

5·You can consult a dictionary of place names.

你可以查地名字典。

6·When (you are) in doubt, please consult a dictionary.

有疑问的时候，就请查字典。

7·Consult a dictionary if you don't know the meanings of these words.

如果你不知道这些词的意思，查查词典吧。

8·E. g. : : If you don't know how to spell a word, consult a dictionary.

例句：如果你不知道怎么拼写单词，你可以去查字典。

9·When (you are) in doubt about the meaning of a word, consult a dictionary.

如果你对一个词的意思不确定的话，查查字典好了。

10·You can also consult a dictionary, an encyclopedia, or any other written reference.

你也可以向字典、百科全书或者任何书面文献寻求信息。