You cannot say, "I never heard of it. I don't know where it came from."
你就不能再说,"我从没听说过,我不知道它是怎么来的"
耶鲁公开课 - 基础物理课程节选
I don't know if you've heard of the concept of the Wounded Healer.
我不知道你有没有听说过创伤治愈者这个概念。
治疗心灵 - SpeakingMax英语口语达人
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