是一个数字，指示了窗口的上沿的位置。

Is a number, the pixel location of the top edge of the window.

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参赛者不允许使用墙体上沿和踩到地面。

Racers are not allowed to use the top of the wall or the ground.

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在比赛中有许多 球击中网的上沿的时刻。

There are moments in a match when the ball hits the top of the net.

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So as we go down we're now adding electrons to further and further away shells, so what we're going to see is that the atomic radius is going to increase as we're going down the periodic table.

当我们向下走时,我们会将电子加在越来越远的壳层上，因此我们将看到原子半径,将随我们沿周期表向下走而增大。

麻省理工公开课 - 化学原理课程节选