This is one of the biological properties, the naturally occurring properties of plasmids, is that they exist in microbial populations and they confer on them resistance from toxins that would ordinarily kill them.

这就是这类生物学特性之一,它是质粒所具有的自然特性,这些质粒存在于微生物群体中,并赋予微生物抗性,使它们免于被毒素杀死

耶鲁公开课 - 生物医学工程探索课程节选

which means that I have to take one of Arts and one of philosophy and one of biological sciences

还意味着我必须选一门艺术类课程，一门哲学类和一门生物学类课程，

伯克利的课程计划 - SpeakingMax英语口语达人