来自《耶鲁大学开放课程：基础物理 第1集 第1集》

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  Then that's all you really need to know.
  这些信息对你们来说足够了
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  Then he knows it's going to go up, it's going to curve,
  所以他就知道 这颗糖会先向上 再向下
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  follow some kind of parabola,
  沿着某条抛物线运动
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  then his hands go there to receive it.
  然后他就能判断在哪里接住糖
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  That is verification of a prediction.
  这就是预测的根据
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  His prediction was, the candy's going to land here,
  他的预测是 糖将会落到这里
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  then he put his hand there.
  所以他把手伸到这里
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  He also knew where the candy was going to land,
  这名同学也知道糖的落点
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  but he couldn't get his hand there in time.
  但是他没能及时的接住
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  But we can always make predictions.
  我们总能作出预测
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  But this is a good example of what you need to know.
  这个例子很好地说明了你需要知道什么
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  What is it you have to know
  关于这个物体