During this period, there was an average of sixty-three attacks worldwide each year.

VOA: special.2009.06.16

I computed the average return on stocks over that time period and I computed the average return on bonds over that time period.

我计算了那个时间段的股票平均收益率,和债券平均收益率。

耶鲁公开课 - 金融市场课程节选

And even if over a period of time the average amount of their regard is lower because they started lower and then got higher than someone who was always high, it's the ones who were first lower who then went up that capture our attention.

即使在一段时间内,他们对我们的评价依然不高,但是因为起点较低,只要是在日益改善，总比一开始就对我们评价好的人更有吸引力，正是开始低而慢慢增加的人,会引起我们的注意。

耶鲁公开课 - 心理学导论课程节选