他讲了一个病人的故事，一个第一次做母亲的人，抱怨她的小儿子总是缠着她，无论她去哪里，他总是缠着她。

He tells the story of a patient, a first-time mother who complained that her young son was always clinging to her, wrapping himself around her legs wherever she went.

youdao

过去，70%的八年级和十年级学生每月看一次电影，甚至更多，但现在只有约一半的人这样做。

While 70 percent of 8th and 10th grade students used to go to the movies once a month or more, now only about half do this.

youdao

研究人员发现，那些一年至少一次为牙齿做专业清洗和打磨的人，患上心脏病的风险降低了将近四分之一。

They found that those who have their teeth professionally cleaned and polished at least once a year cut their risk of a heart attack by nearly a quarter.

youdao

So when someone comes to me, and they're about to do a test, I ask them, what do you expect your program to do?

因此当很多人找到我想要，做一次实验的时候，我问他们你期待你，的程序返回什么结果呢？

麻省理工公开课 - 计算机科学及编程导论课程节选

Your religious and spiritual life is not something that you complete and sit back, satisfying.

一个人的宗教生活，精神生活,并非做了一次就可以去歇着。

普林斯顿公开课 - 人性课程节选