Why couldn’t they just throw it down a storm drain?
普罗斯女士写道“为什么他们不能仅仅把它扔到暴雨下水道?
I have here a tennis ball and I can bounce this tennis ball, I can throw it down.
我这里有个网球,要是把它对着地面扔,它会弹起来。
Whether I drop an object or throw it vertically up or I throw it vertically down, it's all one-dimensional.
当我把物体扔出去,无论是垂直向上扔,还是垂直向下扔,这都是一维运动。
There is this building and it's going to be 15 meters high, and I'm going to throw something and it's going to go up and come down.
这是一栋大楼,它有15米高,我会抛出某个物体,它将先上升后下降
That means, if you are going in a plane and you throw something up in the air, it seems to be going up and down to you.
也就是说,如果你在飞机中,你向空中扔出一物体,它也许会相对于你上下运动
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