A viaduct is a long bridge carried on a row of tall legs or arches, built to keep a road or a railway level while the ground below drops away. Think of a train line crossing a wide valley: instead of going down one side and up the other, engineers build a viaduct straight across, and the train stays flat.

A viaduct viaduct is是 a long bridge carried on a row of tall legs or arches一種靠一排高高的橋墩或拱撐起來的長橋, built to keep a road or a railway level用來讓公路或鐵路保持水平 while the ground below drops away即使下方的地面往下陷. Think of a train line crossing a wide valley想像一條鐵路要橫越一個寬闊的山谷: instead of going down one side and up the other工程師不會讓鐵路先下坡再上坡, engineers build a viaduct straight across而是直接蓋一座 viaduct 橫跨過去, and the train stays flat讓火車保持水平.

The key idea is the row of supports. An ordinary bridge often crosses in one span; a viaduct marches across on many pillars, one after another, and it is usually long and high.

The key idea is關鍵的概念就是 the row of supports那一排支撐. An ordinary bridge一般的橋 often crosses in one span通常一跨就過去了; a viaduct marches across on many pillars, one after anotherviaduct 則是靠很多橋墩一個接一個撐過去, and it is usually long and high通常又長又高.

Old ones in Britain are beautiful brick arches; new ones are plain concrete. It does not have to cross water — that is the main difference from most bridges people picture.

Old ones in Britain英國的舊 viaduct are beautiful brick arches是漂亮的磚拱; new ones新的 are plain concrete則是樸素的水泥. It does not have to cross water它不一定要跨越水面 — that is the main difference from most bridges people picture這是它跟大家想像中的橋最大的不同.

A viaduct can cross a dry valley, a town, farmland, or another road. Taiwan's high speed rail runs on viaduct for most of its length, above the fields of the western plain, though in Chinese we normally call that 高架橋.

A viaduct viaduct can cross可以跨越 a dry valley, a town, farmland, or another road乾涸的山谷、城鎮、農地，或另一條路. Taiwan's high speed rail台灣高鐵 runs on viaduct for most of its length大部分路段都是走 viaduct, above the fields of the western plain架在西部平原的田野上方, though不過 in Chinese we normally call that 高架橋中文我們通常叫它「高架橋」.

The word is a noun, countable: a viaduct, two viaducts. It feels a little formal or technical — engineers, news reports and travel writing use it. In everyday talk people just say bridge, or 高架.

The word is a noun, countable這個字是可數名詞: a viaduct, two viaductsa viaduct、two viaducts. It feels a little formal or technical感覺有點正式或專業 — engineers, news reports and travel writing use it工程師、新聞報導和旅遊寫作會用它. In everyday talk日常說話 people just say bridge, or 高架大家就說 bridge，或講「高架」.