So, speed is a number. It tells you how fast you are going along your trajectory. I mean, if you're driving in a car, then it tells you how fast you are going.
速率只是一个数字，它告诉你，在轨道上，运动的快慢，我的意思是如果你开着一辆车，那么它就告诉你你现在开得有多快。
How can you tell if you are going to overflow your bucket if you don't know how full it is?
如果在不知道你的水桶有多满的情况下要把它充满，你说你会怎样做？
So the first thing I want to do is to shoot it up vertically and how are you going to help me to calculate... to tell me how high it is?
首先需要,竖直射出钢珠,你们需要做的是告诉我。,它飞的高度？
I asked, "Where are you going?" he answered me, "to measure Jerusalem, to find out how wide and how long it is."
我说，你往哪里去？他对我说，要去量耶路撒冷，看有多宽多长。
I asked, "Where are you going?" he answered me, "to measure Jerusalem, to find out how wide and how long it is."
我说，你往哪里去？他对我说，要去量耶路撒冷，看有多宽多长。
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