抑制剂一般是小分子，他们不可逆转地结合在受体上阻碍其正常功能，而兴奋剂可以是小或大分子。

Antagonists tend to be small molecules that bind irreversibly to the receptor preventing its normal function, while agonists may be small or large molecules (e.g. peptide or protein hormones).

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改为——问题是抗体能识别和做出反应的分子是像蛋白质这样的大分子，这也是细菌，病毒和其他致病原的特征。

The problem is that the molecules antibodies recognise and react to are the big ones, such as proteins, that are characteristic of bacteria, viruses and other infectious agents.

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血液分子和一些大分子例如，蛋白质，是无法渗透隔膜的，而小分子仍然可以通过。

The membrane is impermeable to blood cells and large molecules such as proteins, but small ones can get through it.

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It's very water soluble and it's a big molecule, a very big molecule; it can't naturally get inside cells on its own.

它是一个水溶性极强的大分子,非常非常大的分子,质粒在自然状态下并不能自己进入细胞

耶鲁公开课 - 生物医学工程探索课程节选

It turns out that getting large molecules like this, particularly large charged molecules like nucleic acids, inside of cells is not so easy.

后来证实,将这样的大分子物质,尤其是像核酸这样带有大量电荷的分子,送入细胞不是一件容易的事

耶鲁公开课 - 生物医学工程探索课程节选

So we're going to finish talking about molecular orbital theory, we'll switch over to discussing bonding in larger molecules, even larger than diatomic, so we'll move on to talking about valence bond theory and hybridization.

我们要结束关于分子轨道理论的讨论，转向讨论大分子的成键，比二原子分子更大的分子，我们会继续讨论价电子成键理论,和杂化。

麻省理工公开课 - 化学原理课程节选