研究这种药草的农学家发现，它会产生大量的组氨酸，这种氨基酸在试管溶液中会使这些金属具有化学惰性。

Agronomists studying the herb have discovered that it produces large amounts of histidine, an amino acid that, in test-tube solutions, renders these metals chemically inert.

youdao

如果你想要了解更多像以上列出的药草补充剂的相关副作用，那么国家健康卫生研究所的数据库和网站是一个很好的资源。

If you want to learn more about the side effects of common herbal supplements like the ones listed above, the National Institute of Health's Medline Plus site is an invaluable resource.

youdao

直到那时，医生和外科医生们大都在研究药草。

Until then, mostly doctors and surgeons studied herbs.

youdao