You can switch from one shell window to another in a flash, and you can leave shells running perpetually and reconnect at any time.

可以从一个shell窗口迅速切换到另一个窗口，可以离开正在运行的shell并在任何时候重新连接。

youdao

For a few minutes he tapped the switch after each flash, on average every six seconds.

最初几分钟，每闪一次他揿一下按钮，平均每六秒钟一次。

youdao

The end cover switch is loosened, a circuit is cut off, and the electric flash device stops flashing.

旋松端盖开关，电路断开，电闪光装置停止发光。

youdao

In 20 minutes it can switch from production of, say, a 24-exposure camera without a flash to a 36-exposure flash camera.

FORBES: The Detour Economy

The flash adds a bit too, but that'll lay dormant until you pop it out via the devoted switch just to the left of the bump, on top of the camera.

ENGADGET: Casio's Exilim EX-H50 superzooms its way to Photokina, we go hands-on (video)