这样的人力能量能够提供电子设备充电所需的备用电源，降低能耗并减少温室气体排放。
Such people power could provide an alternative to mains charging of electronic gadgets, reducing energy consumption and greenhouse gas emissions.
这些描述被USB设备用来指示它拥有多少连接，以及是否有外部电源支持。
The descriptor is used by USB devices to indicate how many connections it possesses and whether it has an external power supply.
该地带的优点在于它关闭备用电源的所有周边设备如扬声器，游戏机和DVD播放器。
The beauty of the strip is it turns off stand-by power to all peripheral items, like speakers, game machines, and DVD players.
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