1
be a megacity
megacity 是可数名词，表示“大城市”时常用“a megacity”的形式。
Shanghai is a megacity in eastern China.
上海是中国东部的一座大城市。
大城市；特大城市
先理解核心含义，再看它在真实句子里的用法。
大城市；特大城市
a very large city, usually with a population of more than one million
Shanghai is a megacity in eastern China.
上海是中国东部的一座大城市。
指人口超过100万的城市
特大城市,通常人口超过一千万。
A very large city; a megalopolis, typically one with population over 10 million.
Tokyo is often called a megacity because more than thirty million people live in the area.
东京常被称为特大城市，因为该地区居住着三千多万人。
The government is building new subway lines to connect every part of the megacity.
政府正在修建新的地铁线路，以连接这座特大城市的各个部分。
Many megacities face serious housing problems as their populations keep growing.
许多特大城市随着人口不断增长而面临严重的住房问题。
megacity 是可数名词，表示“大城市”时常用“a megacity”的形式。
Shanghai is a megacity in eastern China.
上海是中国东部的一座大城市。
复数形式为 megacities，注意 y 变 i 加 es。
Many megacities have serious traffic problems.
许多大城市都有严重的交通问题。
The cost of living in a megacity can be very high.
在大城市的生活成本可能非常高。
Not this
There are many megacity in China.
Use this
There are many megacities in China.
megacity 是可数名词，复数形式为 megacities；many 后应接可数名词复数。
Not this
Tokyo is a megacity city.
Use this
Tokyo is a megacity.
megacity 本身就是名词，意为“大城市”，再加 city 会造成语义重复，直接用 megacity 作表语即可。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
全球特大城市
Tokyo is often called a global megacity.
东京常被称为全球特大城市。
特大城市居民
Megacity dwellers face high living costs and long commutes.
特大城市居民面临高昂的生活成本和漫长的通勤。
特大城市人口
The megacity population continues to grow rapidly.
特大城市人口持续快速增长。
不断扩张的特大城市
Mexico City is a sprawling megacity with a rich history.
墨西哥城是一座不断扩张的特大城市，拥有悠久的历史。
特大城市基础设施
Megacity infrastructure requires massive investment and careful planning.
特大城市基础设施需要大量投资和周密规划。
特大城市的兴起
The rise of megacities is reshaping economies and environments.
特大城市的兴起正在重塑经济与环境。
Use megacity naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
mega（巨大）+ city（城市）= 特大城市，记住 mega 就是“大”，人口超百万的大城市。
语域：formal 常见场景：城市研究、新闻报道、规划文件 megacity 多用于正式或书面语境，如城市研究、新闻报道和规划文件；日常口语中较少使用。
真正同韵的是 city /ˈsɪti/，因为 megacity 词尾的 city 也读 /sɪti/。注意很多以 -city 结尾的单词并不读 /sɪti/，如 velocity、atrocity、scarcity、capacity、publicity 都读 /səti/，只是拼写相似，发音不同。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.