rock areas的用法和樣例：
例句
- The structure of soil and rock is extremly complex in the discordance formation system in Karst area.
摘要岩溶地區不整合地層系統之岩土構成複雜。 - It could be concluded that the grassland animal husbandry is the priority sector for poverty elimination in Karst areas.
對城步縣發展奶業的情況進行了介紹，結果表明草地畜牧業是改變岩溶地區貧窮面貌的首選產業。
