...a pile of sand...是什么意思？

...a pile of sand...

一堆沙子

pile

n. 桩，一堆，绒头，摞；vt. 堆起，堆叠，放置，装入；vi. 蜂拥，拥挤；

例句
I was looking for my handbag, which was buried under a pile of old newspapers.
我正在找我那被埋在一堆旧报纸下面的手提包。

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。

sand

n. 沙，沙滩，沙色；vt. 撒沙于，用砂纸磨光；

例句
... the mile of white sand beach bordered by palm trees and tropical flowers
四周种有棕榈树和热带花卉的长达1英里的白色沙滩