Although power packs and mobile hand generators are good back-ups, they can be bulky and a nuisance when traveling.
虽然一些电源组和移动手摇发电还可以起到救急作用，但是对于旅行者来说笨重又麻烦。
As a source of power for cars, fuel cells have been a disappointment. For laptops and mobile phones, they are just about to take off.
作为给汽车提供动力的一种能源，燃料电池令人失望。对笔记本电脑和移动电话来说，他们还刚刚开始起步。
Power meters are often considered for mobile-telephone production testing, because they can quickly measure peak power, average power, and peak-to-average ratio.
功率计经常用于手机生产测试，因为它能快速的测量峰值功率，平均功率，峰均比。
They are widely used in rescue or telecommunication facilities as mobile back-up power supply, in industrial mining, rural areas and oil fields as temporary emergency power supply.
应用于军事、救灾抢险或电讯设施，作为机动备用电源；应用于工矿、农村和油田，作为临时应急电源。
They are widely used in rescue or telecommunication facilities as mobile back-up power supply, in industrial mining, rural areas and oil fields as temporary emergency power supply.
应用于军事、救灾抢险或电讯设施，作为机动备用电源；应用于工矿、农村和油田，作为临时应急电源。
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