按下向下键时，应该显示弹出列表。

When the down key is pressed, the pop-up list should be shown.

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Michael再次按下向下的按钮，是同样的结果。

Michael presses the button again; again the same result.

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惊恐中担心想象中的那些脸庞有了细纹，前方的战场上没有血流成河。没有枪炮的轰鸣，或者向下指着的冒烟的枪口下的哀求。

With a thousand pains that vision's face was grained, yet no blood reached there from the upper ground. And no guns thumped or down the flues moaned.

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And some of them might be spinning clockwise, in which case, according to the right-hand rule we would consider them spin-down.

而另一些电子则是在顺时针自旋，在这种情况下，根据右手定理,我们会以为它是在向下转。

麻省理工公开课 - 固态化学导论课程节选

With a thousand pains that vision's face was grained; Yet no blood reached there from the upper ground, And no guns thumped, or down the flues made moan.

惊恐中担心想象中的那些脸庞有了细纹;,前方的战场上没有血流成河，没有枪炮的轰鸣，或者向下指着的冒烟的枪口下的哀求。

耶鲁公开课 - 现代诗歌课程节选

Part of what we're doing in Princeton everyday is running to the next thing, to the next thing, to the next thing, always remind us on the next thing, and here you take a moment and realize the incredible richness of this moment.

我们每天在普林斯顿,都要奔向下一件事，下一件事，下一件事，总是被提醒着有下一件事，此时，花一些时间,体会到此刻,无可比拟的丰富。

普林斯顿公开课 - 人性课程节选