This is the first time this natural system has been exploited for drug delivery.

这是第一次利用自然分类系统开发药物输送技术。

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We’ve shown that a natural system could be exploited to deliver drugs across the blood-brain barrier.

我们用自然分类系统可发出了跨过血脑屏障的药物技术。

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Wetland design is a natural system that can be designed for high performance and low maintenance.

湿地设计项目是设计一个具有高利用性和低维护要求的自然系统。

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Your body's natural defense system needs to be at its strongest to protect you against disease.

VOA: special.2009.04.29

Another example is in the nervous system, patients that have Parkinson's disease have too little of a natural ligand called dopamine.

另一个例子有关神经系统,帕金森氏病的患者,缺乏一种叫做多巴胺的天然的配体

耶鲁公开课 - 生物医学工程探索课程节选

Autoimmune diseases affect the immune system C the body's natural defenses for fighting disease.

VOA: special.2009.04.14

As them if they really support the idea that a long-term stable natural system can be dominated by extraordinarily high levels of positive feedback.

FORBES: Truthmarket Challenge Demonstrates Everything That Is Wrong With the Global Warming Debate

They're making plans now for -- even as they drill these two relief wells that optimistically will take quite some time -- how do we plug this leak either through using the robotics to effect the valve -- how are we dispersing this so that that oil never gets to the top and then through a natural system gets -- largely dissipates at the bottom?

WHITEHOUSE: Aboard Air Force One En Route Andrews Air Force Base

Alpha-interferons are natural immune system chemicals, some of which have been developed as hepatitis drugs.

BBC: Human gene patents defended