Internal back pressure cross-port design allows both rods to be retracted with the air off to easily clear jammed parts.

内部反压跨端口设计使两棒，与空气过收回以轻松地清除堵塞部分。

youdao

It's reversible, that means that p external, equals p. I'm doing it very slowly so that I'm always in equilibrium between the external pressure and the internal pressure so I can go back and forth.

我都可以不损失能量，而把过程逆向进行,整个过程中的,每一步都保持平衡,现在我们来分别。

麻省理工公开课 - 热力学与动力学课程节选

While the internal FIFA investigation continues, the United States will sit back and let the rest of the world put pressure on FIFA to clean up corruption.

FORBES: FIFA Chaos Could Get U.S. Another Shot At Hosting World Cup