这条路最崎岖的部分是穿过那片布满碎石的区域。

The ___roughest section of this road is through the area covered with broken stones.

孩子们在操场上玩得很疯，这是他们最粗暴的游戏了。

The kids played wildly on the playground—it was their ___roughest game yet.

这个模型只是个粗糙的初稿，还需要很多改进。

This model is just the ___roughest draft and needs a lot of improvements.