You take a nine-month-old and for Piaget a nine-month-old is just starting to make sense of objects and their permanence.

你找到一个九个月大的婴儿,在皮亚杰看来,九个月大的婴儿才刚刚发展出,客体以及客体永存性的概念

耶鲁公开课 - 心理学导论课程节选

And nine months later, they leave honor above great level, begging for some more work and wanting to hang out with you on the weekend.

九个月后，他们成绩优异，恳求更多作业,希望与你共度周未。

哈佛公开课 - 幸福课课程节选

And so, what we tested was nine-month-olds and twelve-month-olds, and we showed them movies.

被试是九个月大和十二个月大的婴儿,我们给他们看些影片

耶鲁公开课 - 心理学导论课程节选

In Alexis de Tocqueville's great Democracy in America, which he published in 1831,or published in 1837, after his famous nine-month tour of the United States the most famous book, travel book, ever written about America, by a foreigner.

亚利西斯·德·托克维尔的著作《美国民主》,在1831年,或者1837年出版,这是本他在美国周游了九个月之后,写成的游记,在所有由外国作家执笔,所著的关于美国的书中享有盛誉

耶鲁公开课 - 美国内战与重建课程节选

One of the most interesting questions we continuously ask ourselves at Accel over the last year and nine months, why didn't we see the Facebook earlier?

在过去的一年九个月里,我们Accel人常问自己一个有趣的问题，为什么我们没早点见到脸谱网呢？

斯坦福公开课 - 扎克伯格谈Facebook创业过程课程节选