1
a/an + precious stone
可数名词，单数形式前常用不定冠词。
She found a precious stone in the river.
她在河里发现了一块宝石。
宝石；贵重宝石
precious stones — plural of precious stone
先理解核心含义，再看它在真实句子里的用法。
宝石；贵重宝石
A valuable gem such as a diamond or ruby, especially one used in jewellery.
She found a precious stone in the river.
她在河里发现了一块宝石。
任何因其稀有或珍贵而昂贵的宝石,如钻石或红宝石；尤指镶嵌在珠宝上的宝石。
Any gem, such as a diamond or ruby, that is expensive because of its rarity or desirability; especially one set into a piece of jewelry.
She wore a necklace with a precious stone at the center.
她戴了一条项链，中间有一颗宝石。
The ring contained a small precious stone, possibly a diamond.
戒指上镶嵌了一颗小宝石，可能是钻石。
He gave her a precious stone as a symbol of his love.
他送给她一颗宝石，作为他爱的象征。
可数名词，单数形式前常用不定冠词。
She found a precious stone in the river.
她在河里发现了一块宝石。
复数形式表示一类或多颗宝石。
These precious stones are very expensive.
这些宝石非常昂贵。
特指上文已提及或双方已知的宝石。
The precious stone was stolen last night.
那颗宝石昨晚被偷了。
Not this
I bought precious stone.
Use this
I bought a precious stone.
'precious stone'是可数名词，单数形式前须加冠词或限定词；汉语无冠词，学习者常遗漏。
Not this
She collects precious stone.
Use this
She collects precious stones.
'precious stone'作为可数名词，复数需加-s；汉语名词无复数变化，故易忽略。
Choose the next layer that will help you use precious stones with more confidence.
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Revisit a common error or keep this word in your review list.
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.