The power generating element is used in such a state that the battery element is externally wrapped by a laminated film or the battery element is stored in the external case.

功率产生元件在电池元件被层叠膜从外部包裹或电池元件容纳在外壳中的状态下使用。

youdao

Of course in the reversible case, you're always pushing against an external pressure, which is essentially equal to the internal pressure.

当然在可逆的情况下，外压力，总是，等于内部压力。

麻省理工公开课 - 热力学与动力学课程节选

Remember it's the external pressure that's important. In this case, because it's a reversible process, the external pressure turns out to be always the same as the internal pressure.

是过程非常缓慢,比如我把体积，从V1压缩到V2时，我做得十分缓慢,在过程中的任何一点。

麻省理工公开课 - 热力学与动力学课程节选

"In a tablet market defined by staid black and white tablets, the new colorful MediaPad offers a personalized look without the need for an external case, " said Richard Yu, Chairman, Huawei Device.

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Of course, there is still quite a bit of work to be done to make this work: iPhones do not have removable batteries, nor do they support multi-tasking, meaning that some sort of ruggedized, battery-powered external case would be necessary to get this battle-ready -- as well some jailbreaking.

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Small flames were noted in one of the two incidents reported when gases escaping from the battery were ignited by an electrical short-circuit in the presence of ambient oxygen, but that was all external to the battery case.

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