constant external pressure 恒外压
Constant pressure at external boundary 边界定压
I mean maybe up the street we whisper, but here we know it. And, so here is a different kind of system where we have a constant external pressure.
或许在街上你们低声细语，但在这里不应该这样，这是另一个系统，我们有一个恒定的外压强。
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