鸟类病毒的几个突变就足以使一个病毒重新具有杀伤力，并能使之在人群中传播。
Just a couple of mutations in birds suffice to actually make a virus hotter, and so make a virus transmissible from human to human.
略微的突变即可使微生物具有抵抗力，使药物完全失去杀伤力，这种突变是一个进化优势，大大加快了耐药性的产生。
Slight mutations that allow a microorganism to resist the full killing power of a medicine are an evolutionary advantage that greatly expedites the development of drug resistance.
应用推荐