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power pack

noun
🔊/ˈpaʊə pæk/
🔊/ˈpaʊər pæk/
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  1. a device that stores and supplies electrical power. Power packs are usually designed to be easy to carry with you.
    • They are offering a discount on portable power packs for tablets and phones.他们为平板电脑和手机的便携式电源提供了折扣。