Like, a group of researchers in Germany studied the Artemisia annua plant, which produces a little bit of a drug that combats malaria.

比如，德国的一组研究人员研究了黄花蒿（Artemisia annua），这种植物能产生少量抗疟疾的药物。

He has observed it even between closely related forms (as Matthiola annua and glabra) which many botanists rank only as varieties.

他甚至在密切相关的形式（如 Matthiola annua 和 glabra）之间观察到它， 许多植物学家仅将其列为变种。

Together with her team, Tu managed to extract a substance from Artemisia annua that proved effective in reducing mortality rates for patients suffering from malaria.

屠呦呦及其研发团队成功提取青蒿素，并有效减少了疟疾患者的死亡率。