人吸入氧气，呼出二氧化碳。
吸入硫化氢10分钟后，小白鼠的氧气吸入量和二氧化碳呼出量都降至极低，而且只要继续供给硫化氢，小白鼠的生命体征就保持在这个状态。
The mice's consumption of oxygen and production of carbon dioxide dropped ten minutes after they began inhaling hydrogen sulphide and remained extremely low as long as the gas was administered.
然后人类与其它哺乳动物和鸟类在物质形体吸入氧气而呼出二氧化碳，在维持生存中创造了一个彼此支持的共生关系。
Humans along with other mammals and birds then inhale the oxygen and exhale carbon dioxide in the physical creating a symbiotic relationship where one supports the other in the continued existence.
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