So you could use sort of negative selection in order to find the ones that you want.

这样你就可以用某种负向选择,去找到你想要的细菌

耶鲁公开课 - 生物医学工程探索课程节选

This process of using a biological event like resistance to Ampicillin in order to pick out the cell population that you're interested in is called selection.

这个利用生物特性,如对氨苄青霉素的抗性,来挑出你所感兴趣的细胞的过程叫筛选

耶鲁公开课 - 生物医学工程探索课程节选