1
a(n) elevated railway
表示单数概念时，前面通常用不定冠词 an。
The city built an elevated railway to reduce traffic congestion.
这座城市修建了一条高架铁道以减少交通拥堵。
高架铁路
elevated railways — plural of elevated railway
先理解核心含义，再看它在真实句子里的用法。
高架铁路
An elevated railway is a rapid transit line whose tracks run above street level on a viaduct or other raised structure.
The city built an elevated railway to reduce traffic congestion.
这座城市修建了一条高架铁道以减少交通拥堵。
轨道位于街道上方的高架桥或其他高架结构上的快速轨道交通。
A rapid transit railway with tracks above street level on a viaduct or other elevated structure.
The city's elevated railway provides a scenic view of the downtown area.
城市的高架铁道提供了市区的风景。
Many residents prefer the elevated railway because it avoids traffic congestion.
许多居民更喜欢高架铁道，因为它避免了交通拥堵。
The construction of the elevated railway required extensive planning and engineering.
高架铁道的建设需要大量的规划和工程。
表示单数概念时，前面通常用不定冠词 an。
The city built an elevated railway to reduce traffic congestion.
这座城市修建了一条高架铁道以减少交通拥堵。
elevated railway 可作定语修饰其他名词，如 system, line, station 等。
The elevated railway system is expanding rapidly.
高架铁道系统正在迅速扩展。
表示位置关系时常用介词 on。
Trains run on an elevated railway through the downtown area.
火车在高架铁道上穿过市中心区域。
Not this
I took a elevated railway to the airport.
Use this
I took an elevated railway to the airport.
因为 'elevated' 以元音音素开头，所以不定冠词要用 'an'，而不是 'a'。
Not this
The high railway was built in the 1920s.
Use this
The elevated railway was built in the 1920s.
虽然 'high' 可以表示高度，但表示高架铁道应使用 'elevated railway'，这是固定说法。
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Dictionary facts from ECDICT, WIKTIONARY.