My research focus is on what happens to our immune system as we age.

我的研究重点是随着年龄的增长，我们的免疫系统会发生什么变化。

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Is communication so important to our survival and marriage system as individuals?

沟通对我们作为个体的生存和婚姻制度是否如此重要？

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But some earn half that and are on the same pay system as cleaning people.

VOA: special.2009.08.13

This is commonly used in the immune system as well, but it's a way of amplifying a signal.

免疫系统也常使用这种方法,但这主要是一种放大信号的方式

耶鲁公开课 - 生物医学工程探索课程节选

So even if we had a transportation system as nice as San Francisco,

所以即使我们有旧金山那样好的交通系统，

大众交通枢纽 - SpeakingMax英语口语达人

We propose strategies for measuring individual contributions to the risk to the system as a whole.

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SunPower plans to offer a 2.5-kilowatt system as part of its marketing campaign with Ford.

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Studying health care in the criminal justice system as it relates to black inmates.

CNN: Report sees 'sobering statistics' on racial inequality