...a mossy wall.是什么意思？

...a mossy wall.

长满青苔的墙壁

mossy

adj. 长满苔藓的，苔藓似的；

例句
...a disordered heap of mossy branches.
一堆杂乱的长满苔藓的树枝

wall

n. 墙，屏障，隔阂，壁垒；vt.& vi. 筑墙围住，用墙隔开，围以墙；adj. 墙壁的；

例句
On a table pushed against a wall there were bottles of beer and wine.
在一张靠墙的餐桌上有啤酒和葡萄酒。