One has to be a certain age to appreciate these improvements; the first car I drove was a 1953 Pontiac.
人是需要在一个特定的年代才能感受到这些进步的；我的第一部汽车是1953年版的庞蒂亚克。
The second case, I bounce one car onto another one - which is twice the mass — - certain velocity which I don't know what it is — and now what are we going to get?
而第二个例子中，用一辆车撞另一辆，后一辆质量是它的二倍-，不知道速度多大-，现在我们得到什么？
The second case, I bounce one car onto another one - which is twice the mass — - certain velocity which I don't know what it is — and now what are we going to get?
而第二个例子中，用一辆车撞另一辆，后一辆质量是它的二倍-，不知道速度多大-，现在我们得到什么？
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