No air pressure.

是不是没有气了？

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Some swimmers are able to equalize the pressure in their heads, which means no air comes out, and no water goes in. These are the lucky ones.

一些游泳者能够均衡压在他们头上，这意味着没有空气出来，而且没有水进去。这些是幸运的。

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They found no association between back pain and temperature, humidity, air pressure, wind direction or precipitation.

他们发现，无论是气温、湿度、气压、刮风还是降雨，都与人们的腰痛没有关联。

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"By that I mean try to imagine creating a cavity inside your mouth without any air bubbles and by letting in no air through your lips or throat -- it's basically impossible at sea level because the air pressure outside your mouth pushes the air pocket closed, " he said.

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It uses no other motors, and the strength of the grasp is controlled by a change in air pressure, making the hand quite dextrous.

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