The hardest task that television asks of anyone is to turn the power off after he has turned it on.

电视让人们做的最困难的任务是在打开电视后把电源关掉。

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He fell off the 20ft-high bridge, landed among power cables and ended up on the rails.

他从20英尺高的桥上摔下来，落在电缆之间，最后落在铁轨上。

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I realized that the handrail would not come off, which meant we could no longer be able to replace the power supply and repair that instrument, which meant scientists could no longer look at the universe and find life on other planets.

我意识到，扶手不会脱落，这意味着我们再也无法更换电源供应和维修仪器，这意味着科学家们再也无法观察宇宙，在其他星球上寻找生命。

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"Someone could attack the industrial control systems that control all the valves, all the distribution systems, and are used to turn on and off various aspects involved with energy and the electrical power grid and oil and gas distribution networks,".

VOA: standard.2009.08.11

With an astonishing 480Hz refresh rate, LED local dimming, 2D THX Certification and its eye-catching super-slim frame, the LX9500 makes for a stunning display whether the power is on or off.

ENGADGET: LG's 3D bundle adds two pairs of glasses, $100 rebate and Under the Sea 3D disc

Power flickers on and off.

ECONOMIST: War in Libya

Developed for a convenient user experience, the new players provide an array of convenience offerings that greatly reduce power on, disc load and power off times as a result of proprietary software and hardware solutions.

ENGADGET: Pioneer intros BDP-120 / BDP-320 / Elite BDP-23FD Blu-ray players