机体和组织与周围环境交换气体；肺吸入氧气呼出二氧化碳。

Body and organizations to exchange gases with the surrounding environment; lung oxygen and exhale carbon dioxide.

一个呼出二氧化碳而与此同时另一个呼出氧气。

And one exhales carbon dioxide while the other exhales oxygen.

在蛋的内部胚胎吸入氧气，呼出二氧化碳。

Inside the egg, the embryo breathes in oxygen and exhales carbon dioxide.