But whenever we've had a reform era there's been a big issue, or two or three or four.

但每当我们有一个改革的时代,都会存在一个,两个,三个或者四个大问题

耶鲁公开课 - 美国内战与重建课程节选

And I've divided these into two groups, the big three and the more interesting four.

我将其分为两组，三大因素和四个有趣因素。

耶鲁公开课 - 心理学导论课程节选

The students were brought into this course were in that interesting gap in the professions where they have been with the company for a couple of years but will probably be four more years before they consider for the big leap, for the big advancement.

参与该课程的学生,职业差别很大,他们还会在,现在的公司待几年,甚至可能在考虑,跳槽或升迁之前，再待四年之久。

麻省理工公开课 - 媒体、教育、市场课程节选

Wouldn't natural selection favor the people who take introductory psychology, come to my Valentine's Day lecture, listen carefully to the big three and the more interesting four, ? and then go out there and put them into practice?

自然选择会不会青睐,那些学习心理学导论，在情人节来听我讲座，专心致志听我讲影响吸引力的三大因素,和四个有趣因素，然后在生活中应用这些知识的人？

耶鲁公开课 - 心理学导论课程节选