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？

youdao

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。

youdao

The different stocks tend to move up and down together.

不同的股票会同时涨跌。

youdao

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

Even so, the net gain or net loss will be small, however, because exports and imports move up and down together.

FORBES: Exports Create Better Jobs, But Not Necessarily More Jobs

Since exports and imports do move up and down together, logic suggests that exports can be encouraged indirectly by encouraging imports.

FORBES: Exports Create Better Jobs, But Not Necessarily More Jobs

More likely is that Chicago's move up and down the league table was mainly noise, not a real change in performance.

ECONOMIST: Dodgy business