我们的女儿九个月大就会走路了。

Our daughter could walk when she was nine months old.

《牛津词典》

时间飞快，九个月一点一点地过去。

Time passed, and the nine months grew shorter and shorter.

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这场戏剧上演了九个月。

This drama lasts nine months.

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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。

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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