很驚訝？我跟你一樣LOL

這些數據是從Pont du Gard博物館看到的，不過每公裏2厘米實在是令人難以置信。

維基是這樣寫的 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. 

我在博物館照下來的：