想要了解这个,你可以想象雨滴本身是静止的,而你和脚下的土地在雨中向上移动。而由于平行六面体(也就是个立体的平行四边形)的体积完全不取决于它的倾斜度,于是不管你平行移动得多快,每秒一样的雨量将会落在你的头顶上。现在,如果你不移动,从上方来的雨就是所有你会淋到的。但是如果你在移动,你也将会碰上来自侧边的雨滴,并且变得更湿。
So in any given second, you stay driest by standing still, and the faster you move the wetter you become. But if you’re trying to get from point A to point B, then standing still won’t do you much good. And en route from point A to point B, the total amount of rain you run into from the side has nothing to do with how fast you’re going, just like how a snowplow will plow the same amount of snow from a stretch of road, regardless of the exact speed it drives.
所以在任何一秒钟,站者不动可以让你保持最为干燥,而你移动的越快,就会变得越湿。但如果你试着从A地到达B地,那么站着不会给你多大的帮助。在A地到B地的路途上,你从侧边碰上的总雨量跟你移动的多快完全没有关系,就像是为何铲雪车不论行驶的确切速度,在一段路程上将会铲等量的雪。
In the case of running through the rain, you can figure that out using parallelepipeds again. So over a given period of time, the same amount of rain will hit you from the top, regardless of how fast you’re going. And over a given distance, you’ll hit the same amount of rain from the side — again, regardless of how fast you’re going.
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