The respiratory system plays an important role in maintaining our internal environment at the proper level of oxygen, by bringing the right amount in.

呼吸系统的重要性在于,通过向体内输入适量的氧气,维持人体内环境中的氧平衡

生物医学工程探索课程节选 : 耶鲁公开课

The renal system has an equally important function in that way, in maintaining your water balance.

泌尿系统也同样十分重要,它能够维持体内的水平衡

生物医学工程探索课程节选 : 耶鲁公开课