And that was only possible because, besides using the sea, the shipping lanes for travel, which was much faster than overland travel, the Romans maintained roads.

之所以能达到这个数字，原因之一是走海路，用海洋航路运输，比陆路快得多，另一个原因就是修路。

耶鲁公开课 - 新约课程节选

All right, so hand your numbers to the end of the row, but don't go yet.

把你们写的数字传到最后一排,先别走

耶鲁公开课 - 博弈论课程节选