Texas cedarwood contains a natural substance that can form crystals in the oil.

德克萨斯州柏木含有的一种天然物质，可以形成晶体的油。

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Nevertheless, pullulan is a natural substance, as is apparent from its chemical structure.

普鲁兰多糖是一种天然物质，看其化学机构即可一目了然。

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It replaces the natural substance dopamine, which is lacking in Parkinson's disease patients.

它取代了帕金森患者缺少的天然多巴胺。

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An agonist is a substance that mimics the action of a natural ligand, and I show you a couple of examples of agonists here.

激动剂是能够模拟天然配体分子的物质,在这里我给出了一些激动剂作为例子

耶鲁公开课 - 生物医学工程探索课程节选

This would an example of a substance that inhibits the action of a natural ligand and they can inhibit in a variety of ways.

这类物质能够以多种方式,抑制天然配体的作用

耶鲁公开课 - 生物医学工程探索课程节选

So how to spruce things up, and add some substance to the natural geographic rivalries?

FORBES: Time For Baseball to Realign

CytImmune Sciences of Rockville, Maryland, has just begun a study of the efficacy of Aurimune, a solid-gold nanoparticle that carries a dose of tumour necrosis factor (TNF), a substance that has a natural tendency to stick to gold.

ECONOMIST: Treating tumours

With natural TNF that does not matter, since the substance is produced only in the tumour itself.

ECONOMIST: Treating tumours