You're going to find out, you know, one of these years when you start teaching that when you get really close to a blackboard, you just cannot think.

过几年以后,你们渐渐就会发现,当你开始教课,当你离黑板真的很近的时候,你就没法思考了

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A third example is when you're pondering something. Maybe you haven't quiet made up your mind,

第三种情况是，当你在思考一些事的时候，你可能还没有完全想好。

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