metropolypus

例句：

1. 1.The metropolitan area is home to many unique species of fish.
   这个大都会地区有许多独特的鱼类。
2. 2.The metropolitan police are investigating the disappearance of a rare species of fish.
   大都会警察局正在调查一种稀有鱼类的失踪事件。
3. 3. The metropolitan area has been experiencing a decline in water quality due to pollution.
   大都会地区由于污染而水质下降。