He told students it was time for them to learn what it means to be a human being on Earth at a time when every living system was failing.

VOA: special.2009.06.05

And, that can be anything from a computer to a living system.

它们产生于一台电脑,最后变成一个实际可用的系统。

麻省理工公开课 - 固态化学导论课程节选

but also like the university system in general like, here you're living in a university with people.

而且由于大学里总体的制度规定，你在这里能够真正地与人交流。

来自西班牙 - SpeakingMax英语口语达人

How is your immune system going to recognize that this virus is there causing bad results if it's living inside of a cell and doing all its business inside a cell where antibodies can't get to it?

你的免疫系统怎样才能识别,作恶多端的病毒呢,如果它隐藏在细胞中进行繁殖,而抗体又无法进入细胞,那该怎么办

耶鲁公开课 - 生物医学工程探索课程节选