...accumulations of dirt.是什么意思？

...accumulations of dirt.

积尘

accumulations

n. 积累( accumulation的名词复数 )，堆积物，累积量，<会计>（利润、息金带来的）资本增益；

例句
Everything in her person was round and replete, though without those accumulations which suggest heaviness.
她身上的一切都圆圆的,显得饱满, 然而并不给人以笨重的肥胖感觉.

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

dirt

n. 泥土，污垢，污泥，下流想法，恶意中伤的话；

例句
They all sit on the dirt in the dappled shade of a tree.
他们全都坐在斑驳树阴下的泥土地上。