如果你回答说是的，那么你就又错了。我们所能够完全肯定的一点只是这两列火车之间的相对速度变了。
If your answer is yes, then you are wrong again. All we can be certain of is that the relative speed between the two trains changed.
如果你也像我一样，是只“云雀”，或者说是个惯于早上活动的人，那么你很可能就会在这段时间最需要靠生物钟叫醒自己。
If, like me, you are a "lark," or morning person, your strongest period of clock-dependent alerting occurs at this time.
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