gas exchange就是气体交换。例如： discontinuous gas exchange cycle 不连续气体交换循环，缩写为DGC。 gas exchange in tissues 内呼吸 pulmonary gas exchange 肺气体交换，肺换气 respiratory gas exchange 呼吸气体交换 dead space gas exchange 死腔气体置换 intravenous blood gas exchange 静脉血气交换