The clouds are nothing but fogs in the upper regions of the atmosphere; fog itself is nothing but a cloud immediately over ground.
其实，云跟雾是一样的东西，可以认为，所谓云，就是升到大气层高处的雾，而当云的高度降到地面的时候，就成了雾。
The shaking you feel when you are underground is about half of what you would experience over ground.
地下感受到的震动大约只有地上的一半。
The two trains collided on an over-ground stretch of the Washington metro system at around 5 p. m. during the evening rush hour.
两辆地铁在晚上下班高峰期大约5点钟左右在华盛顿地铁系统的地面以上路段相撞。
The two trains collided on an over-ground stretch of the Washington metro system at around 5 p. m. during the evening rush hour.
两辆地铁在晚上下班高峰期大约5点钟左右在华盛顿地铁系统的地面以上路段相撞。
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