And the answer,she says, is that bilingual people are often better at controlling their attention -- a function called the executive control system.

VOA: special.2011.03.09

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

Professor Reppert says scientists thought they understood the control system in the monarchs until they took a closer look at the insects' antenna.

VOA: special.2010.04.27

Researchers at the University of Toronto in Canada are studying a mobile phone system that may help people with diabetes control their blood pressure.

VOA: special.2010.12.06

And his quality control system at Motown was like a similar system in car factories.

VOA: special.2009.05.11

"The brain-machine interface is a system that allows disabled people, people suffering from physical disabilities to communicate with external world and also to control devices."

VOA: special.2011.04.04

Neil Armstrong took manual control of the guidance system and, with just 20 seconds of fuel remaining, coasted to a landing.

VOA: standard.2009.07.16

Daryll Kimball,the Executive Director of the Arms Control Association, a private research firm, says President Obama is more skeptical about the missile-defense system.

VOA: standard.2009.07.15