很惊讶？我跟你一样LOL

这些数据是从Pont du Gard博物馆看到的，不过每公里2厘米实在是令人难以置信。

维基是这样写的 https://en.wikipedia.org/wiki/Pont_du_Gard：The aqueduct's average gradient is only 1 in 3,000. It varies widely along its course, but is as little as 1 in 20,000 in some sections. 

我在博物馆照下来的：