They drove the Confederates back. Grant then ordered the rest of his army to cross to the east side of the river.

VOA: special.2009.11.19

And there's been some efforts cross-culturally, to go back to the question this young man asked before looking at cross-cultural differences in toilet training and weaning, which are really big differences, to see if they correspond in any interesting way to personality differences.

回到刚才那位同学提出的问题，确实也已经有些跨文化的研究试图探究,在如厕训练和断奶上的跨文化差异,这些差异是非常大的，而这些研究的目的，是为了看看这些跨文化上的差异,是否与人格差异存在着某种联系。

耶鲁公开课 - 心理学导论课程节选

It's a more powerful method than something called a cross-sectional study, and I'll come back in a later lecture and talk about these in more detail, but a cross-sectional study means you're taking a snapshot of a population of people at one time.

这种方法比所谓的横断面研究更加有效,我将在以后的课中,再仔细讨论这个问题,但横断面研究是指,你一次记录下一群人的状况

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

and Mexican officials. Every day, thousands of people on foot and in vehicles go back and forth across the border here, and millions of dollars worth of products cross the line in trucks and railroad cars.

VOA: standard.2009.04.30