1
eat/have/use [mustard] (as condiment)
芥末用作调味品时通常不可数，不能用a修饰。
I like to have mustard on my hot dog.
我喜欢在热狗上放芥末。
芥末；芥菜
mustards — plural of mustard
先理解核心含义，再看它在真实句子里的用法。
芥末；芥菜
a plant from the Brassica family, whose seeds are ground to make a spicy condiment
I like to have mustard on my hot dog.
我喜欢在热狗上放芥末。
某些芸苔属植物或相关属植物,尤其是黄花和线形种荚的白芥属植物
A plant of certain species of the genus Brassica, or of related genera (especially Sinapis alba, in the family Brassicaceae, with yellow flowers, and linear seed pods).
几种属于芥属的十字花科植物
any of several cruciferous plants of the genus Brassica
由芥菜种子制成的粉末或酱,用作调味品或香料
Powder or paste made from seeds of the mustard plant, and used as a condiment or a spice.
由磨碎的芥末籽制成的辛辣粉末或糊状物
pungent powder or paste prepared from ground mustard seeds
I spread mustard on my sandwich for extra flavor.
我在三明治上涂了芥末来增加风味。
She added a teaspoon of mustard to the salad dressing.
她在沙拉酱里加了一茶匙芥末。
This recipe calls for both yellow and Dijon mustard.
这个食谱需要用到黄芥末和第戎芥末。
芥末用作调味品时通常不可数，不能用a修饰。
I like to have mustard on my hot dog.
我喜欢在热狗上放芥末。
芥末黄是一种颜色，常用于描述衣物。
She wore a mustard-colored sweater.
她穿了一件芥末黄色的毛衣。
这是一个非正式习语，意为达到预期或要求的标准。
He failed the test because he couldn't cut the mustard.
他考试不及格，因为他未达到标准。
作为植物，mustard既可用作不可数（整体种类）也可用作可数（不同品种）。
Mustard is often grown for its seeds.
芥末常因其种子而被种植。
Not this
He added a mustard to the sandwich.
Use this
He added mustard to the sandwich.
Mustard（芥末）通常为不可数名词，不加不定冠词a。
Not this
This sauce tastes mustard.
Use this
This sauce tastes like mustard.
表示‘尝起来有芥末味道’时，需用介词like或of，不能用形容词直接作表语。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
芥末籽
Mustard seeds are ground to make the condiment.
芥末籽被磨碎制成调味品。
芥末酱
I like to dip my pretzel in mustard sauce.
我喜欢把椒盐卷饼蘸芥末酱吃。
芥子气
Mustard gas was used as a chemical weapon in World War I.
芥子气在第一次世界大战中被用作化学武器。
芥菜叶
Mustard greens are often cooked with bacon or ham.
芥菜叶常与培根或火腿一起烹饪。
芥末粉
Add a teaspoon of ground mustard to the marinade.
在腌料中加入一茶匙芥末粉。
辣芥末
Spicy mustard pairs well with sausages.
辣芥末和香肠很搭。
达到要求，符合标准
He didn't cut the mustard in the final exam.
他期末考试没达到要求。
非常热心的，极其渴望的
She is as keen as mustard to start her new job.
她非常渴望开始新工作。
芥菜籽（比喻微小但潜力巨大）
Faith as small as a mustard seed can move mountains.
信心像芥菜籽那么小也能移山。
Use mustards naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
mustard = must (必须) + ard (硬的)，吃热狗时硬的芥末酱是必须的。
语域：neutral 常见场景：cooking、gardening “mustard”作为“芥末”或“芥菜”时，通常用于日常生活和烹饪场景，属于中性词汇，正式和非正式场合均适用。
作为调味品通常不可数；表示种类或植物时可数。
Dictionary facts from ECDICT, WIKTIONARY.