Without gravity to help circulate air, the carbon dioxide you exhale has a tendency to form an invisible cloud around your head.
如果没有重力帮助空气循环，你呼出的二氧化碳会在你头顶周围形成一个看不见的云状物。
Start by planting 10 trees we each need to absorb the carbon dioxide we exhale.
每个人从种10棵树开始，就可以吸收我们呼出的二氧化碳了。
After everybody rests, each minute must inhale the person 300 milliliters oxygen to exhale 250 milliliters carbon dioxide.
人人睡后，每分钟要吸人300毫升氧气呼出250毫升二氧化碳。
Take a little extra time to exhale, since leaving residual carbon dioxide in the lungs can impede the delivery of oxygen on the next inhale.
呼气用时略多，因为从肺脏排出的残余CO2可以阻碍下一次吸气的氧气输送。
Take a little extra time to exhale, since leaving residual carbon dioxide in the lungs can impede the delivery of oxygen on the next inhale.
呼气用时略多，因为从肺脏排出的残余CO2可以阻碍下一次吸气的氧气输送。
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