他们应该仅仅起防御作用！

They should only be deployed in a defensive role!

youdao

该系统对于现代空中突击的防御作用有限。

The system is of limited use against modern adversaries.

youdao

气有五个基本生理功能：推动作用、温煦作用、防御作用、气化作用和固摄作用。

Qi can be seen to have five basic function activation, warming, defense, transformative action and containment.

youdao

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