translation.en: And to do that meant creating the flattest gradients that had ever yet been made, which meant building long viaducts across river valleys -- this is actually the viaduct across the Thames at Maidenhead -- and long tunnels such as the one at Box, in Wiltshire.
translation.zh: 要做到意味着做出当时还没有的 最平的道路坡度， 也就是说造出穿越河谷的长高架桥 -- 这其实就是横跨梅登黑德的泰晤士河的高架桥 以及如同威尔特郡的长隧道