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A culvert is a pipe or a small tunnel that lets a stream, or , pass under a road, a railway, or a path. Without it, water would sit on the road or cut across the tracks. You see culverts as a round pipe-mouth in a bank, or as a small concrete channel under a farm track. Engineers and country people use the word; city walkers may never say it, even when they walk over one. It names a physical thing, not a metaphor in ordinary English.
涵洞（讓溪水或雨水從馬路、鐵路底下過去的管子或小通道）。
組成Origin obscure. People have guessed a dialect word; a forgotten inventor’s name; French couvert (“covered”), though French does not use couvert this way and the French for this thing is ponceau or buse de drainage; or an unrecorded Dutch mix of coul- (from French couler, to flow) and vaart (canal). None of these is settled.
原始詞典資料2 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
culvertnoun/ˈkʌlvə(ɹ)t/
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A channel crossing under a road or railway for the draining of water.
- A raft of twigs stayed upon a stone, suddenly detached itself, and floated towards the culvert.
- After she left, I ran away for a day, and hid myself, solitary, in a culvert under the railway lines.
culvertverb/ˈkʌlvə(ɹ)t/
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To channel (a stream of water) through a culvert.
- This led to a great deal of straightening and culverting, which in turn led to a massive loss of biodiversity.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。