...a beach of coarse sand.是什么意思？

...a beach of coarse sand.

粗沙海滩

beach

n. 海滩，海滨，岸上的沙子和卵石；vt. 将…拖上岸，将滑艇拖到小屋前面的岸边；

例句
Other people walk along the beach at night, so I didn't pay any attention at first...
入夜后还有人在沙滩上散步，起先我并没注意到。

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。

coarse

adj. 粗鄙的，粗糙的，粗野的，粗制滥造的；

例句
...a jacket made of very coarse cloth.
粗布制成的夹克

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