It's late in the evening: time to close the book and turn off the computer.

已经很晚了，是时候合上书，关掉电脑了。

youdao

Set the camera to manual mode and turn off the flash.

把相机调到手动模式，并且要关上闪光灯。

youdao

RITA: Why don't we turn on the picture and turn off the sound?

丽塔：为什么我们不打开画面而关掉声音呢？

youdao

They used light-sensitive molecules to turn on and off nerve cells in the deep brain structure of mice.

VOA: special.2009.04.07

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

And when you turn the current off, the magnetic field collapses.

当你切断电流，电磁场就消失了。

麻省理工公开课 - 媒体、教育、市场课程节选

But if donors were to grow disillusioned and turn off the taps, the shock would be immense.

ECONOMIST: Uganda

Dear listeners: if you are under 40, go ahead and turn off the radio, this next story is not for you.

NPR: The iPod, an Electronic Fountain of Youth

The kettle was whistling now, and I thought to leave it, so that Sall would have to get up and turn off the gas.

NEWYORKER: The Cold Outside