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The patient breathing system further comprises an arrangement (11) by which driving gas of the ventilator (2) has been separated from the patient gases flowing in the circle.
所述患者呼吸系统还包括装置（11），通过所述装置（11）使所述呼吸器（2）的驱动气体与在所述循环系统中流动的患者气体相分离；
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