The mirrors could orbit—thousands of miles high—at the same speed as the earth turns on its axis.
这些镜子可以在几千英里的高空以地球绕地轴旋转的速度运行。
When you go snorkeling by a school of fish, you will see every single one of those fish swimming along at the same speed.
当你在一群鱼旁边浮潜时,你会看到每一条鱼都以同样的速度游动。
How does it come about now that the Alps erode at the same speed that they rise?
为什么现在阿尔卑斯山会以它上升相同的速度被侵蚀呢?
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