The experts now recommend testing every two years for that age group.

VOA: special.2009.11.18

is to see through the group of human rights, if there are certain levels of social justice that we can ensure for every last person simply because they are human.

它提出要看到所有这些人权的本质，如果存在不同层次的社会正义,我们就要保证每个人获得某种程度的正义,就因为他们是人。

普林斯顿公开课 - 人性课程节选

A cohort study means you take the same group of people and follow them every five years for that period of time.

定群研究意味着你只有一组研究对象,然后在研究期间每五年进行一次记录数据

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

"Students are stepping up and leading in unprecedented ways and for every obstacle you can come up with there is a student group really confronting that obstacle in ways that can be adapted to other settings,".

VOA: standard.2009.12.08