So, it's awkward to have to wait for a cow to get infected before you can vaccinate a population.

在给人们预防接种之前,你只有干等着,直到有一头奶牛感染了病毒才行

耶鲁公开课 - 生物医学工程探索课程节选

They let you practice as an attorney if you haven't gone to law,

如果你没有干过律师这行，他们也会让你当律师，

想成为律师的话 - SpeakingMax英语口语达人

Because you can hire someone who is a software engineer and he's been doing it for 10 years and if they're doing it for 10 years that's probably what they're doing for their life, you know, and I mean that's cool.

你可以聘用一名,有着十年工作经验的软件工程师,如果他已经在这行业,待了十年了，那么可能这辈子他都会干这行，这样不错。

斯坦福公开课 - 扎克伯格谈Facebook创业过程课程节选