The object of this research was to get some natural active substances from algae.

本研究的目的是为了从海藻中获得天然抗病活性物质。

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This article mainly discusses the summary, necessity and method of SAR study of natural active constituents.

本文主要探讨进行天然活性成分的构效关系研究的概况、必要性和方法。

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Contain nanoscale natural active pearl essence, characterized by high activity, high absorption and full nutrition.

采用纳米级的天然活性珍珠精华，具有高活性、易吸收、全面营养等特点。

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But the body's natural defenses are usually strong enough to prevent an active case.

VOA: special.2009.03.25

Children may make the ideal patients for these procedures since they have natural and active abilities to heal and grow.

CNN: Toddler gets new windpipe from her own stem cells

My family owns property in Wise County Texas that has two active natural gas wells on our property.

FORBES: Guest Post: Natural Gas

In September, I visited China, where my organization, the Natural Resources Defense Council, has been active for nearly 15 years.

CNN: Obama's China trip is high-stakes mission for environment