sand可数吗?

例句

sand on the floor scrunched under our feet.

地板上的沙子在我们脚下嘎吱作响。

sand martin is a brown bird with white underneath.

崖沙燕是一种褐羽白腹的`鸟。

all walked barefoot across the damp sand to the water's edge.

他们全都光着脚走过潮湿的沙地来到水边。

ship has come to rest on the fine sand.

这艘船停靠在细沙滩上。