1
a grain of sand
sand为不可数名词，表示数量时用量词。
There is a grain of sand in my eye.
我眼睛里有一粒沙子。
沙；沙子
先理解核心含义，再看它在真实句子里的用法。
沙；沙子
loose granular material consisting of small grains of rock or coral, found on beaches and in deserts and used in construction
There is a grain of sand in my eye.
我眼睛里有一粒沙子。
岩石经研磨后比砾石细但不如粉砂细的颗粒,构成海滩和沙漠,也用于建筑。
Rock that is ground more finely than gravel, but is not as fine as silt (more formally, see grain sizes chart), forming beaches and deserts and also used in construction.
由岩石或珊瑚颗粒组成的松散物质
a loose material consisting of grains of rock or coral
直径在 62.5 微米至 2 毫米之间的颗粒(按温特沃斯分级标准)。
A particle from 62.5 microns to 2 mm in diameter, following the Wentworth scale.
法国作家,以关注女性权利和独立的作品而闻名(1804-1876)
French writer known for works concerning women's rights and independence (1804-1876)
The children played happily in the sand at the beach.
孩子们在海滩的沙子里开心地玩耍。
The desert is covered with vast stretches of sand.
沙漠被大片大片的沙子覆盖。
He poured sand into the bucket to build a castle.
他把沙子倒进桶里，准备建造一座城堡。
sand为不可数名词，表示数量时用量词。
There is a grain of sand in my eye.
我眼睛里有一粒沙子。
常与定冠词连用，指代沙滩或沙地。
The children are playing on the sand.
孩子们在沙滩上玩耍。
固定短语，表示某处有沙子。
I hate getting sand in my shoes.
我讨厌鞋子里进沙子。
Not this
There are many sands on the beach.
Use this
There is a lot of sand on the beach.
英语中 'sand' 是不可数名词，不能加 -s 或与 many 连用。应使用 a lot of 或 much 修饰，动词用单数。
Not this
I need a sand for my sandcastle.
Use this
I need some sand for my sandcastle.
'sand' 不可数，不能直接与不定冠词 a 搭配。表示泛指时用 some，或说 a grain of sand。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
沙堡
Children built a sand castle on the beach.
孩子们在沙滩上堆了一个沙堡。
沙丘
The desert is covered with sand dunes.
沙漠被沙丘覆盖。
沙尘暴
A sand storm reduced visibility to zero.
一场沙尘暴使能见度降为零。
砂纸
He smoothed the wood with sand paper.
他用砂纸把木头磨光滑。
沙箱
The kids played in the sand box.
孩子们在沙箱里玩耍。
沙坑障碍
His golf ball landed in a sand trap.
他的高尔夫球落进了沙坑障碍。
逃避现实；拒绝面对问题
You can't just bury your head in the sand and hope the problem goes away.
你不能只是把头埋进沙子里，希望问题消失。
光阴；时间的流逝
The sands of time are running out for the endangered species.
这种濒危物种的时间不多了。
划定界限；表明立场
The CEO drew a line in the sand, demanding higher safety standards.
首席执行官划定了界限，要求更高的安全标准。
我不喜欢沙子。它又粗又糙又恼人，还会进到任何地方。
He echoed Anakin's sentiment: 'I don't like sand.'
他重复了阿纳金的话：‘我不喜欢沙子。’
Use sand naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
Sand音似'散的'，沙子是散开的颗粒。
通常指由岩石或珊瑚颗粒组成的松散材料，多用于日常描述、建筑或地质领域，语域中性。
All listed words rhyme with 'sand' (sound: /ænd/). No lookalikes with different pronunciation are included.
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY, WORDNET.