Well, one reason is that there are developmental disorders that seem to involve damage to one system but not to another.

一个原因是,发展障碍看上去,只会对某一个系统产生损害,而不会损害其他系统

耶鲁公开课 - 心理学导论课程节选

One is because we understand the bone marrow system so much better than we understand all the other stem cell systems.

一个原因就是我们对骨髓系统的认识,远高于其他干细胞系统

耶鲁公开课 - 生物医学工程探索课程节选

Another is that we learned a lot of things about engineering of public systems, like water supplies.

另一个原因是,我们懂得了有关公共系统知识,比如供水系统

耶鲁公开课 - 生物医学工程探索课程节选

That's what leads to some of the complexity of function of the nervous system.

这就是导致,神经系统功能多样性的原因

耶鲁公开课 - 生物医学工程探索课程节选

As it does that it changes the volume of the heart and gives the - creates the pressure that moves blood around your body, so it has that muscular system.

这使心脏的体积发生变化,产生了足以使血液流遍全身的压力,这就是心脏中有肌肉系统的原因

耶鲁公开课 - 生物医学工程探索课程节选

So that's a negative feedback control system.

这就是负反馈控制系统得名的原因

耶鲁公开课 - 生物医学工程探索课程节选