an underway under + noun
underway 作名词时可数，指从另一条道路或障碍物下方穿过的通道，常与 under 连用。
The city built an underway under the busy railway.
这座城市在繁忙的铁路下方修建了一条下穿道。
水下航行；航行；地下通道；下穿道；地下通道；地铁；隧道；航行,尤指水下航行
A road or path that goes beneath another road or obstacle; an underground passage or tunnel.
地下通道；下穿道
A road, track, path, or street for going under another way or obstacle; an underpass.
地下通道；地铁；隧道
An underground passage, subway, tunnel.
航行,尤指水下航行
A voyage, especially underwater.
The city built a new underway so that pedestrians could cross beneath the busy road safely.
市政府新建了一条地下通道，让行人可以安全地从繁忙的马路下方穿过。
用法提示：underway 在此作可数名词，指供人从道路下方穿过的地下通道。
Heavy rain flooded the underways near the station, so we had to take a long way around.
大雨淹没了车站附近的几条地下通道，所以我们只好绕了很远的路。
用法提示：underways 是 underway 的复数形式，作名词，指车站附近的多条地下通道。
A narrow underway connects the hotel lobby directly to the shopping center across the street.
一条狭窄的地下通道把酒店大堂直接与街对面的购物中心连接起来。
用法提示：underway 在此作名词，指连接两座建筑的地下通道。
underway 作名词时可数，指从另一条道路或障碍物下方穿过的通道，常与 under 连用。
The city built an underway under the busy railway.
这座城市在繁忙的铁路下方修建了一条下穿道。
复数 underways 表示多条地下通道；beneath 比 under 更强调正下方。
The underways beneath the old town are dark and narrow.
老城下方的地下通道既阴暗又狭窄。
through 强调从内部穿过，underway 可指隧道或地下通道。
Engineers dug an underway through the hill.
工程师们挖了一条穿过山丘的隧道。
grammar · medium
易错句子The city built three new underway under the railway last year.
正确表达The city built three new underways under the railway last year.
underway 是可数名词，复数形式是 underways。汉语名词不随数词变化，所以中文母语者常在数词后保留名词原形；英语中 three、several 等数词后必须用可数名词的复数形式。
grammar · medium
易错句子They dug a underway so pedestrians could cross safely.
正确表达They dug an underway so pedestrians could cross safely.
underway 以元音音素 /ʌ/ 开头，前面要用 an。虽然它拼写以字母 u 开头，容易让人照 a university 的模式写成 a，但这里 u 读 /ʌ/ 而非 /juː/，所以必须用 an。
人行地下通道
Pedestrians can use the pedestrian underway to cross the busy road.
行人可以使用人行地下通道穿过繁忙的马路。
车辆下穿道
The new vehicular underway helps cars avoid the intersection.
新的车辆下穿道帮助汽车避开这个路口。
铁路下穿道
A railway underway carries trains beneath the main road.
铁路下穿道让火车从主干道下方通过。
水下航行
The submarine began a week-long underwater underway.
潜艇开始了为期一周的水下航行。
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Dictionary facts from ECDICT, WIKTIONARY.