A road, path or tunnel built to pass underneath another road or a railway, so that the two do not cross each other. There are two everyday kinds and it helps to keep them apart.

A road, path or tunnel built指蓋來的道路、通道或隧道 to pass underneath another road or a railway穿過另一條路或鐵路下方， so that the two do not cross each other讓兩者不會交叉。There are two everyday kinds日常生活中有兩種 and it helps to keep them apart最好把它們分開來想。

One is for cars: a lane that dips down and runs beneath a busy junction — Taipei drivers meet these all the time. The other is for people on foot, a short tunnel with steps or a ramp at each end, so that you can get to the other side of a big road without walking across it; British speakers call this a 'subway' too, which is a real trap for learners because in American English 'subway' means the underground train.

One is for cars一種是給車的： a lane that dips down and runs beneath a busy junction車道往下沉，從繁忙的路口下方穿過 — Taipei drivers meet these all the time台北的駕駛常常會遇到這種。The other is for people on foot另一種是給行人的， a short tunnel with steps or a ramp at each end一段短隧道，兩端有樓梯或坡道， so that you can get to the other side of a big road讓你能到大馬路的對面 without walking across it不用走過馬路； British speakers call this a 'subway' too英國人也把這個叫做『subway』， which is a real trap for learners這對學習者來說是個真正的陷阱 because in American English 'subway' means the underground train因為美式英語裡『subway』是指地下鐵。

If you want to be understood everywhere, 'underpass' is the safe word, or 'pedestrian underpass' when it is the walking kind. Its opposite is 'overpass' (a road carried above another road) — and in British English an 'overpass' for people is usually called a 'footbridge' or 'flyover' for cars.

If you want to be understood everywhere如果你想在哪裡都能被聽懂， 'underpass' is the safe word『underpass』是安全的字， or 'pedestrian underpass'是給行人走的就用『pedestrian underpass』 when it is the walking kind。Its opposite is它的反義詞是 'overpass'『overpass』 (a road carried above another road架在另一條路上方的道路) — and in British English在英式英語裡， an 'overpass' for people給行人的『overpass』 is usually called a 'footbridge'通常叫做『footbridge』 or 'flyover' for cars給車走的則叫『flyover』。

Underpasses have a mild reputation in English-speaking countries for feeling dark and unsafe at night, so you will often see them described as grim, damp, or covered in graffiti. It is a countable noun: an underpass, two underpasses.

Underpasses have a mild reputation in English-speaking countries在英語系國家，地下道有種普遍的印象 for feeling dark and unsafe at night覺得晚上又暗又不安全， so you will often see them described as所以你常會看到它被形容成 grim, damp, or covered in graffiti陰森、潮濕，或塗滿塗鴉。It is a countable noun它是可數名詞： an underpass, two underpassesan underpass、two underpasses。