translation.en: You all know that scientists use what we call model systems, which are creatures -- white rats or fruit flies -- that are kind of stand-ins for all other animals, including people.
translation.zh: 各位知道科学家都使用规摹系统， 里面的生物 -- 白鼠/果蝇等--是相当于 所有其他动物  的替身来的。