I heard him speak when I was teen.
当我还是少年时,我曾听过他演讲。
普林斯顿公开课 - 人性课程节选
I've heard him talk before but it's always interesting.
我曾听过他讲课,他总是不断创新
耶鲁公开课 - 金融市场课程节选
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