So now we're working to try to restore the natural system.

所以我们正努力设法恢复这里的自然生态系统。

youdao

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。

youdao

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。

youdao

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