1
a walnut
I ate a walnut for a snack.
我吃了一个核桃当零食。
核桃
先理解核心含义，再看它在真实句子里的用法。
核桃
the nut of a walnut tree, with a hard wrinkled shell and an edible seed
I ate a walnut for a snack.
我吃了一个核桃当零食。
胡桃属的硬木树
A hardwood tree of the genus Juglans.
核桃树的坚果,壳硬,种子皱缩两裂
nut of any of various walnut trees having a wrinkled two-lobed seed with a hard shell
核桃树的果实
A nut of the walnut tree.
核桃木,质坚,深褐色,常用于家具和镶板
hard dark-brown wood of any of various walnut trees; used especially for furniture and paneling
She cracked a walnut with her hands and gave me the kernel.
她用手敲开一颗核桃，把果仁递给了我。
I bought a bag of walnuts to make brownies for the party.
我买了一袋核桃来做聚会吃的布朗尼蛋糕。
Walnuts are rich in healthy fats, so I eat a few every day.
核桃富含健康脂肪，所以我每天吃几颗。
I ate a walnut for a snack.
我吃了一个核桃当零食。
The walnut tree in our garden is very old.
我们花园里的核桃树很老了。
walnut 指“核桃”时为可数名词，复数是 walnuts；指“胡桃木”时为不可数名词。
The cabinet is made of solid walnut.
这个橱柜是用实心胡桃木制成的。
Not this
I like walnut very much.
Use this
I like walnuts very much.
表示喜欢吃/喜欢某一类坚果时，walnut 是可数名词，要用复数 walnuts 泛指核桃；a walnut 指“一个核桃”，而不加冠词的 walnut 通常指核桃木，不指可食用的核桃。
Not this
This table is made of walnuts.
Use this
This table is made of walnut.
表示“核桃木”时 walnut 是不可数物质名词，不能用复数；made of walnuts 会被理解成用多个核桃果实做桌子，语义错误。
Not this
I bought a walnut's table.
Use this
I bought a walnut table.
名词修饰名词表示材质时，直接用 walnut 作定语，不用所有格 's；'s 表示所属关系，如 a walnut's shell（核桃的壳），而 a walnut table 才表示“核桃木做的桌子”。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
核桃树
A walnut tree can live for more than a hundred years.
核桃树可以活一百多年。
核桃木
The cabinet is made of walnut wood.
这个柜子是用核桃木做的。
黑胡桃木
Black walnut is prized for making fine furniture.
黑胡桃木是制作精美家具的珍贵材料。
核桃油
Walnut oil adds a rich flavor to salads.
核桃油为沙拉增添浓郁的风味。
敲开核桃
She used a nutcracker to crack a walnut.
她用胡桃夹子敲开了一个核桃。
普通核桃
The English walnut is the most common variety.
普通核桃是最常见的品种。
女人、狗和核桃树，越打越好。
The proverb mentions a walnut tree, but it is now often quoted as an example of outdated, sexist attitudes.
这条谚语提到了核桃树，但现在常被引用为反映过时、性别歧视观念的例子。
Use walnut naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
walnut 可拆成 wall + nut：核桃壳硬得像墙，果仁皱缩像大脑。
语域：neutral 常见场景：日常对话、烹饪食谱、木工与家具 walnut 是比较中性的常用词，日常口语、菜谱和木材相关书面说明中都可以使用；正式场合如需强调树种，更常说 walnut tree。
作核桃仁、核桃树讲时可数，作胡桃木讲时通常不可数。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.