Shanghai is the most populous city in China and the most populous city
proper in the world.
这里的proper有玄机。

A global city, Shanghai exerts influence over global commerce, finance, culture, art, fashion, research and entertainment.
The city is located at the middle portion of the Chinese coast, and sits at the mouth of the Yangtze River.
据口译老师判断，这是以英语为母语的人写出来的。