.你理解的问题,这里的sands不是沙子的复数,是沙洲的意思,sand这层意思时就是一个可数名词,并且基本上都用复数 偶尔用单数.
沙滩; 沙洲
Sands are a large area of sand.
沙漠就是大面积的沙地.
Children enjoy playing on the sands.
孩子们喜欢在沙滩上玩耍.
牛津英语同义词词典
sand
[sand]
(noun 名词)
沙
SYNONYM 同义词:grit.
sands 沙滩
SYNONYM 同义词:beach, seaside, shore, [poetic诗歌用语] strand.