His strange habit makes sense when you consider that he's an environmental scientist who studies how to reduce litter, including things that fall off garbage trucks as they drive down the road.

他是一位研究如何减少垃圾的环境科学家，其中包括研究减少垃圾车行驶时掉下来的东西，当你考虑到这一点，自然就能明白他为什么会养成这种奇怪的习惯了。

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Road politeness is not only good manners, but good sense too.

道路礼貌不仅是一种礼貌问题，而且还是一种良好的意识。

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When driving in the mountains, have you ever noticed a discrepancy between the slope described on the yellow road sign and your sense that the incline is actually much steeper?

当你驱车进山，你是否意识到，山路边的黄色斜坡标识比你所感知得到的斜度来得更陡峭？

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