megapolis

What's the synonym of the word "megapolis"?

“大都市”这个词的同义词是什么？

Although the Yangtze Delta Megapolis is the best in China, it can by no means be matched with other five megapolis in function and competitive capacity in the world.

国发展素质最佳的一个城市——长江三角洲城市，其能量和能级都无法和世界上其他五大城市。