translation.en: Studies in model systems like mouse and other animals are also helping do this, but people are now using these technologies because they've gotten very cheap, to study the microbes in and on a variety of people.
translation.zh: 小鼠和其它动物实验模型系统 也正帮助我们研究，但人们现在使用 DNA测序技术是因为成本已经很低 如果要研究不同人体内外的微生物的话