Now these ideas of classes, object-oriented programming, data abstraction, are about 40 years old, they're not new ideas.

面向对象编程的概念，数据抽象的概念，都是40年前就有的老东西了。

麻省理工公开课 - 计算机科学及编程导论课程节选

That's down... probably about 50 blocks or so, 40 blocks. I'm going to walk down there. So I just like to walk.

动物园在离这里四五十个街区远的地方。我要走过去。我只是喜欢散步。

在中央公园溜达 - SpeakingMax英语口语达人

Moses will later marry Zipporah, one of these women, and live as a shepherd in Midian for about 40 years.

后来摩西与西坡拉结婚，她是那些女人中的一个，作为一个牧人在米甸生活了大约四十年。

耶鲁公开课 - 旧约导论课程节选

That space is about 20 to 40 nanometers, it's not a very big space, but it's a significant space.

这个空间距离大概有20到40纳米,不是很大 但是意义重大

耶鲁公开课 - 生物医学工程探索课程节选

Yes,on average, when you look at this group of 40 or 50 twins reared apart, when you look at the average, they are just about the same.

平均而言，当研究这40或50组被分开抚养的双胞胎，大体看来，他们是一样的。

哈佛公开课 - 幸福课课程节选

At the time of the IPO, Baidu had about 40% of the traffic share in China for Chinese search.

当百度IPO上市的时候，百度占据了,中国40%的中文搜索量。

斯坦福公开课 - 百度CEO李彦宏演讲：全球最大搜索引擎的发展课程节选