an onion
可数用法，前面加不定冠词 a/an，指一个完整的洋葱头。
I bought an onion at the market this morning.
今天早上我在市场上买了一个洋葱。
洋葱；洋葱头
onions — plural of onion
洋葱(植株)；葱属植物；一种单子叶植物(葱属),与大蒜近缘,用作蔬菜和调味品。；洋葱的鳞茎；这种植物的鳞茎。
the round edible bulb of an onion plant, used as a vegetable
指作为蔬菜食用的鳞茎
一种单子叶植物(葱属),与大蒜近缘,用作蔬菜和调味品。
A monocotyledonous plant (Allium cepa), allied to garlic, used as vegetable and spice.
洋葱的鳞茎
the bulb of an onion plant
这种植物的鳞茎。
The bulb of such a plant.
具有中空叶子的球茎植物,全球种植,其圆形鳞茎可食
bulbous plant having hollow leaves cultivated worldwide for its rounded edible bulb
各种与洋葱相似的葱属植物。
Any of various plants, mostly of the genus Allium, that are more or less similar to Allium cepa.
一种芳香可口的蔬菜
an aromatic flavorful vegetable
I chopped an onion for the soup.
我为汤切了一个洋葱。
用法提示：“onion”在这里是名词，指洋葱这种蔬菜。
The recipe calls for two onions and a clove of garlic.
这个食谱需要两个洋葱和一瓣大蒜。
用法提示：“onions”是onion的复数形式，作名词表示洋葱。
She cried while peeling the onion.
她剥洋葱时流泪了。
用法提示：“onion”是名词，指洋葱的鳞茎。
可数用法，前面加不定冠词 a/an，指一个完整的洋葱头。
I bought an onion at the market this morning.
今天早上我在市场上买了一个洋葱。
复数形式，泛指两个或更多洋葱，也常用来指作为食材的洋葱。
She added onions to the stew and let it simmer.
她往炖菜里加了洋葱，然后让它慢慢炖。
名词作定语修饰后面的名词时用单数形式 onion，如 onion soup、onion rings。
He made onion soup for dinner.
他晚饭做了洋葱汤。
grammar · medium
易错句子I bought three onion at the market.
正确表达I bought three onions at the market.
onion 是可数名词，前面有大于一的数词时，名词必须用复数形式 onions。汉语名词本身不随数量变化，所以容易漏掉词尾 -s。
grammar · medium
易错句子Onions is good for your health.
正确表达Onions are good for your health.
复数可数名词 onions 作主语时，谓语动词要用复数形式 are，做到主谓一致。汉语动词没有单复数变化，所以容易误用单数 is。
grammar · medium
易错句子I ate too much onions and felt sick.
正确表达I ate too many onions and felt sick.
many 修饰可数名词复数，much 修饰不可数名词；onions 是可数名词复数，所以要用 too many。汉语的“太多”不区分可数与不可数，因此容易一律用 too much。
洋葱汤
She warmed up a bowl of onion soup for lunch.
她午餐时热了一碗洋葱汤。
红洋葱
Add some thinly sliced red onion to the salad.
往沙拉里加一些切得薄薄的红洋葱。
洋葱圈
We ordered burgers with a side of onion rings.
我们点了汉堡，还配了一份洋葱圈。
小葱；青葱
Garnish the noodles with chopped spring onion.
用切碎的小葱点缀面条。
洋葱粉
The recipe calls for a teaspoon of onion powder.
这道食谱需要一茶匙洋葱粉。
Choose the next layer that will help you use onions with more confidence.
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腌洋葱
He ate the pickled onion straight from the jar.
他直接从罐子里拿腌洋葱吃。