hilly country的用法和樣例：
例句
- There is a large hilly area in the northwest.
西北部有一大片丘陵地帶。 - Lush forests of sweet gum trees and maples give way to brush that seamlessly becomes hilly terrain, then opens up to savanna-like plains.
鬱鬱蔥蔥的甜美的桉樹林和楓樹林漸漸被灌木叢取代，由灌木叢過渡到丘陵地帶，然後是一片大草原似的平原。 - The hilly area accounts for a third of the county's cultivated land.
丘陵地佔該縣耕地面積的三分之一。
