1 . 研究团队正要放弃时，他们发现了正是这种物质可以改善从草药中获得的提取物的医疗性能。
The research team ________they found that ________ could improve the medical properties of the extract, ________ the herb. (短语“正要做某事……突然”；强调句句型；非限制性定语从句)