The world's largest city now - Mexico city - currently has 18 million people and a huge array of problems.

现在世界上最大的城市是墨西哥城，目前人口已有1800万。问题成堆。

youdao

The world's largest city now - Mexico city - currently has 18 million people and a huge array of problems.

现在世界上最大的城市是墨西哥城，目前人口已有1800万。问题成堆。

youdao