In the reversible case, an external pressure is essentially equal to the internal pressure.

在可逆的情况下，外部压力基本上等于内部压力。

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In reality, however, this is often not the case when integrating to multiple external systems.

然而，在实际中，当集成多个外部系统时，情况并非如此。

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If you have enabled validation, the value of this feature is ignored, in which case external DTD subsets are always read.

如果启用验证，该特性的值将被忽略，这种情况下总是会读入外部dtd子集。

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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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