来自《耶鲁大学开放课程：基础物理 第1集 第1集》
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follow some kind of parabola,沿着某条抛物线运动 -
then his hands go there to receive it.然后他就能判断在哪里接住糖 -
That is verification of a prediction.这就是预测的根据 -
His prediction was, the candy's going to land here,他的预测是 糖将会落到这里 -
then he put his hand there.所以他把手伸到这里 -
He also knew where the candy was going to land,这名同学也知道糖的落点 -
but he couldn't get his hand there in time.但是他没能及时的接住 -
But we can always make predictions.我们总能作出预测 -
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 -
What is it you have to know关于这个物体 -
about this object that was thrown, I claim,我们需要了解什么 我要强调的 -
is the initial location of the object and the initial velocity.就是这个物体的初位置和初速度