Scientists have even engineered artificial switches to start glowing or giving off some kind of electrochemical or biochemical signal once they are switched "on."
科学家们甚至已经设计了人工开关，当它开启时能够发光和者发出电化学或生物化学信号。
Once it got blank there is nothing I could do to turn it back on. So I switched to my old computer which I bought in 2002.
一旦都黑屏了我做什么都不能重新打开它了，所以我就转而用起了我2002年买的旧电脑。
Once switched, Eclipse views and editors focus on the context of the newly activated task.
切换后，Eclipse视图和编辑器将聚焦于新激活的任务的上下文。
Once the time slot passes the machine returns to zero-watt mode until it is switched on by its user.
一旦此时间空档过去后，这部机器会回到“零瓦”模式，直到使用者开机为止。
Once completed, existing building systems will be switched over to run off the new district hot water system, further reducing dependence on fossil fuels.
一旦完成，现在的建筑体系将形成新的区域热水系统，进一步减少对于化石燃料的依赖。
Once the camera switched on without our being told.
有一次摄影机在没有告知我们的情况下就打开了。
The sun began to burn off the morning mist, and accompanied by the sounds of the waking villages, the pilot switched on the engines and we moved upstream once again.
阳光开始驱散晨雾，伴随着醒来的村庄的喧闹声，驾驶员启动了发动机，我们再次往上游行驶。
The sun began to burn off the morning mist, and accompanied by the sounds of the waking villages, the pilot switched on the engines and we moved upstream once again.
阳光开始驱散晨雾，伴随着醒来的村庄的喧闹声，驾驶员启动了发动机，我们再次往上游行驶。
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