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铁路、公路等下穿的通道 来自维基百科，自由的百科全书
涵洞，又稱暗渠，是一種用來為道路泄水排涵的暗渠或暗管（管狀的涵洞又稱涵管），通常較隧道短小。按照建造方式劃分，可分為圓管涵、蓋板涵等等。
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.
