If a diver ascends too quickly from a high-pressure underwater environment to a lower-pressure one, gases dissolved in blood and tissue expand and form bubbles.

如果潜水员从一个高压的水下环境迅速上浮到一个低压的水下环境，他们的血液和组织中溶解的气体就会膨胀并形成气泡。

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The material use efficiency of China is lower than that of developed countries, and compared to USA, Chinese ecological environment system have more pressure.

中国的物质利用效率低于发达国家，和美国相比，中国的生态环境系统承受了更大的压力。

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