sand是可数名词也是不可数名词。
1、sand的基本意思是“沙，砂”，指细小的石粒时，是不可数名词。“一粒沙”是a grain of sand。
2、sand可作“沙滩”“沙洲”解，含有大片大片的意思，这时多用其复数形式sands。sand还可用于表示地名，如the Goodwin Sands(古德温沙洲)。
扩展资料
例句：
His hair was the colour of sand.
他的头发呈沙褐色。
Sand has silted up the river delta.
泥沙把这条河的三角洲淤塞了。
They lay on the firm sands, listening to the plaintive cry of the seagulls.
他们躺在坚实的'沙滩上，听着海鸥的哀鸣。
Several children were running about on the sands.
几个孩子在沙滩上跑来跑去。
Canada's oil sands are a huge resource.
加拿大油砂资源丰富。
