Turn on the current.

打开当前的。

youdao

Then you run in some water and turn on the current.

然后他就放些水，把电流通上。

youdao

Turn on the current, and in a short time the copper will become so hot that water, when dropped on it, will sizzle away into steam.

打开电流，并在很短的时间铜将成为这么热，水，它下降时，会嘶嘶声变成蒸汽了。

youdao

We can actually see spatially all the details in the field animated as you turn the current on and off.

我们能看到,所有细节的空间动画分布,就在你打开电流和切断的时候。

麻省理工公开课 - 媒体、教育、市场课程节选

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