At present there are 20 different drug classes, say the researchers.

研究人员称，目前抗艾药物有20种。

youdao

So there is a need to increase the number of drug classes, each working in a different way.

因此，人类需要增加作用于不同途径的抗艾药物的种类。

youdao

She taught high school (including anti-drug classes at night), and my stepfather hauled construction trash.

她教高中(还有戒毒所的夜校)，我继父搬运建筑垃圾。

youdao

There are two classes, two broad classes of drug sort of type ligands that are defined, agonists and antagonists.

这样的配体药物有两类,目前已经明确的配体药物大体上分为两种,分别是激动剂和拮抗剂

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