They exhale dirty air inside and inhale fresh one.
用特别的方法排除秽气吸入新鲜空气；
The each hour in human body is each to engrave all at inhale the fresh air, to provide the demand of the machine metabolism;
人体每时每刻都在吸进新鲜空气，以供机体新陈代谢的需要；
The each hour in human body is each to engrave all at inhale the fresh air, to provide the demand of the machine metabolism;
人体每时每刻都在吸进新鲜空气，以供机体新陈代谢的需要；
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