medium and small city的用法和樣例：
例句
- The paper improves forecast veracity and guides work of littoral medium and small cities' air quality forecast model.
對沿海地區中小城市今後開展空氣質量預報工作具有一定的指導意義。 - Yiyang is a middle city which locates in the southern central China.Its urban culture has certain representation.
摘要益陽作為中國中部地區的一座中小城市，其城市文化具有一定的代表性。
