But I expect that like many of our students here that's just one of multiple affinity groups you might have chosen to become part of.

但，我说的没错的话，跟许多别的学生一样,那只是你能够选择的,许多兴趣小组之一。

普林斯顿公开课 - 人性课程节选

Some, like the smallpox vaccine on one exposure generates a very high response that lasts for many years so you don't need a boost.

有一些疫苗,比如接触一次天花疫苗后,人体就能产生高水平的免疫应答,并持续很多年,所以无需再次接种

耶鲁公开课 - 生物医学工程探索课程节选