精选英文背诵：你有一个选择

You Have a Choice

你可以选定一种解释

Two trains are traveling side by side and at the same speed along paralleltracks. We are seated in one of the trains, and with us we have a special speedometer that measures their relative speed. Since the trains are traveling at the same speed, their relative speed is zero; the speedometer therefore reads "0."

两列火车以相同的车速并排地沿着两条平行的轨道往前行驰。我们坐在其中的一列火车上带着特制的速度测量仪，可以测出两列火车之间的相对速度。因为这两列火车是以相同的车速前进的，所以二者的相对速度是零;因此，测速仪上的读数为"0"。

Suddenly the other train seems to start pulling ahead of ours. The speedometer shows a reading of 10 miles per hour. The other train has apparently increased its speed. But can we be absolutely certain of this increase?

突然间另一列火车使我们觉得好像是开始赶到我们所乘坐的火车前头去了。这时测速仪上显示出来的读数是每小时10英里。很显然，另一列火车已经加快了速度。但是，我们能不能肯定是另外那辆火车加快了速度呢?

If your answer is yes, you are wrong. You are wrong because all that we know is that the relative speed between the two trains changed from 0 mph to 10 mph. Nothing more. This change could have been brought about in one of two ways:

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