speak frankly to; conceal nothing from
坦率直言
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I had always been completely open with my mother .我一直在妈妈面前知无不言。
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an open book a person or thing that is easy to understand or about which everything is known坦率的人;一目了然的事物
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her mind was an open book to him .她想些什么,他一看就清楚。