Normally, we do these things to keep an equilibrium among the different systems of the unconscious, but sometimes it doesn't work.

一般来说，我们会运用这些机制,去维持无意识系统的平衡，但有时防御机制也会不起作用。

耶鲁公开课 - 心理学导论课程节选

These are primarily communication systems which act to allow your other organ systems to work in concert.

正是这些基本的通讯系统,保证了体内各系统的协调工作

耶鲁公开课 - 生物医学工程探索课程节选