How do you get these hearts to move up and down and seemingly in random patterns?

你怎样才能让这些爱心看起来是在随机的模式中上下移动呢？

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If you had a motor here that was causing a paddle to move up and down you could cause waves to form at one end of the tank and move from left to right.

如果这里有一个马达，使桨上下移动，就可以在水槽的一端形成波浪，从左到右扩散。

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The different stocks tend to move up and down together.

不同的股票会同时涨跌。

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That is the way that fault operates as well." In other cases, the plates may move up and down, rather than from side to side.

VOA: standard.2010.01.13

And if you had a motor here that was causing a paddle to move up and down you could cause waves to form at one end of the tank and move from left to right.

如果在水槽里放个发动器,来让水上下起伏,波浪形成于,水槽的一端,然后从左向右扩散。

麻省理工公开课 - 固态化学导论课程节选

Well, how do you get this hearts to move up and down and seemingly in these random patterns?

但是，你怎样才能让这些爱心们看起来,像是在某种随机的模式下上上下下地移动呢？

哈佛公开课 - 计算机科学课程节选

Still, the currency swings represent another step toward the internationalization of the yuan, analysts say, as it starts to move up and down like other currencies albeit in a limited range.

WSJ: Firms, in Shift, See End to Yuan's Steady Gains

Moving on, the Zone Touch Mouse T400 has a touch strip that you can use to move up and down through pages, as well as scroll through the live tiles on the Start Screen.

ENGADGET: Logitech outs two wireless mice and an external trackpad, all optimized for Windows 8

But when the big funds use their massive weight to move shares up and down and make huge profits by their manipulation, it is too much to expect us to welcome them.

CNN: A QUESTION OF OPENNESS