Others carried out energy studies of city school buildings to make sure the equipment and systems work effectively.

VOA: special.2009.09.04

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

It is meant to work with personal computers, smartphones and other devices using different operating systems.

VOA: special.2010.06.22

"Safety and security of our volunteers is absolutely our top priority and we are continually looking at this topic and I have to say that in the last few years we have done an amazing amount of work to try to improve both our systems to support volunteers, to ensure confidentiality and to strengthen their preparedness and training."

VOA: special.2011.03.28

Despite the fact that many have been living in Lebanon for generations, they are still refugees, and as such are forced to live in squalid camps, are denied access to the state's social security, health-care or education systems, and can only work in menial jobs.

VOA: standard.2010.06.29