(informal)know nothing about something or about how to do something(非正式)一无所知，一窍不通
英语四级真题
For clues to the book's future, let's look at some examples of technological change and see what happened to the old technology.
出自-2014年6月阅读原文
Herpin offered the only clue to his condition.
出自-2014年6月听力原文
英语六级真题
This experiment certainly does not definitely prove that girls start to reason before boys, but it provides a clue that scientists would like to study more carefully.
出自-2012年12月听力原文
柯林斯高阶英汉双解学习词典释义
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A clue to a problem or mystery is something that helps you to find the answer to it.