You can take a problem that might be relatively intuitive to solve but when you scale this thing up as is increasingly the case in the web, in large data systems, and so forth, you actually have to now think smart, you actually have to think efficiently and you have to solve this problem effectively.

你可以把一个问题用比较直观的方法解决,但如果你把此类问题的数量增大,正如越来越多的互联网，和大规模数据系统中出现的问题等等,你应该考虑怎样才能更简便，怎样才能更高效,你应该用行之有效的方法处理问题。

哈佛公开课 - 计算机科学课程节选

We have got an extensive subway system and an extensive bus system that we have had for 60, 70 years.

我们有大规模的地铁系统和巴士系统，它们已经有差不多六七十年的历史了。

纽约的公共交通 - SpeakingMax英语口语达人