For example, if you're talking about the chalk--if I throw the chalk, you will have to know where it is and how fast it's moving.

比如说,这支粉笔,如果我扔出这支粉笔,你就像知道它的位置和速度

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and they get to know you and maybe assess how good you will be in the lab, so I think,

了解你，评估你在实验室里怎么样，所以我觉得，

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