Conclusion: Galla Chinesis is one kind of effective cariostatic natural agent.

结论：天然药物五倍子具有有效的防龋效能。

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Tea Tree Oil: Tea Tree Oil is a natural agent that is effective against all three categories of infectious organisms: bacteria, viruses and fungi.

茶树精油：茶树精油是一种天然药剂，能够有效对抗所有三大类感染性生物体，分有细菌、病毒、真菌。

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It is not an outlay for the support of labour, or for the provision of implements or materials the produce of labour. It is the price paid for the use of an appropriated natural agent.

支付这种地租不是为了 养活劳动者，不是为了准备工具或原料（它们是劳动产品），而是为使用一种已被人 占有的 自然要素而付出代价。

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Literary agent and friend, David Black says the role Feiler asked him to assume was a natural fit.

VOA: standard.2010.06.19

By using atmospheric air and negative ions, a natural cleansing agent, it fights dirt and bacteria with nature's own weapon, he said.

CNN: Ioning your way to cleaner clothes

And since the fruit has a high pectin content (around 25%) its offers the benefit of being a natural thickening and binding agent.

FORBES: The Superfruit That's Truly Super: Baobab Boosts Health, Poor African Families & Gin

It is dependent on the plasticity of the brain, and on the fact that experience is as powerful an agent of change as natural selection.

NEWYORKER: A Man of Letters