upper side stone

例句：

1. 1.The upper side of the mountain is covered in lush greenery.
   山的上边长满了郁郁葱葱的绿色植被。
2. 2.The builders carefully placed the upper side stones to ensure stability.
   建筑工人小心翼翼地放置了上边石头以确保稳固。
3. 3. The upper side of the road was paved with smooth stones.
   路的上边铺着平滑的石头。