metropolitan area的用法和樣例：
例句
- The capital and largest city of Belgium, in the central part of the country. Officially bilingual(Flemish and French), it became capital of Belgium in1830. Metropolitan area population, 2,395,000.
布魯塞爾比利時首都和最大城市，位於比利時中部。官方使用雙語制(法蘭德斯語和法語)。1830年成為比利時的首都。人口2,395, 000
