a tomato
tomato 是可数名词，单数形式前通常要加冠词 a 或 an。
I bought a tomato at the market.
我在市场上买了一个西红柿。
番茄；西红柿
tomatoes — plural of tomato
番茄（植株）；番茄植物；番茄红；番茄色；一种广泛栽培的植物,番茄；微酸的红色或黄色多汁果实,作为蔬菜食用；这种植物的可食用果实,成熟时通常为红色,在园艺和烹饪中被视为蔬菜
the juicy, mildly acid fruit of the tomato plant, usually red or yellow, eaten as a vegetable
一种广泛栽培的植物,番茄
A widely cultivated plant, Solanum lycopersicum, having edible fruit.
微酸的红色或黄色多汁果实,作为蔬菜食用
mildly acid red or yellow pulpy fruit eaten as a vegetable
这种植物的可食用果实,成熟时通常为红色,在园艺和烹饪中被视为蔬菜
The savory fruit of this plant, most often red when ripe, treated as a vegetable in horticulture and cooking.
原产于南美洲；广泛栽培,品种繁多
native to South America; widely cultivated in many varieties
一种红色,典型的成熟番茄的颜色
A shade of red, the colour typical of a ripe tomato.
I bought a ripe tomato at the market.
我在市场上买了一个成熟的西红柿。
用法提示：此处 tomato 是可数名词单数，作 bought 的宾语，表示“西红柿”。
These tomatoes are juicy and fresh.
这些西红柿多汁又新鲜。
用法提示：tomatoes 是 tomato 的复数形式，在句中作主语，表示“西红柿”。
This is the sweetest tomato I have ever tasted.
这是我尝过的最甜的西红柿。
用法提示：tomato 在句中作表语，表示“西红柿”。
tomato 是可数名词，单数形式前通常要加冠词 a 或 an。
I bought a tomato at the market.
我在市场上买了一个西红柿。
复数是 tomatoes，在词尾加 -es，而不是只加 -s。
She added two tomatoes to the salad.
她往沙拉里加了两个西红柿。
名词 tomato 可直接放在另一个名词前作定语，说明原料或种类，如 tomato sauce、tomato juice。
She made tomato soup for lunch.
她午饭做了西红柿汤。
表示数量时用“数量词 + of + 复数名词”的结构。
He bought a kilo of tomatoes.
他买了一公斤西红柿。
grammar · medium
易错句子I bought three tomato at the market.
正确表达I bought three tomatoes at the market.
汉语名词没有单复数形态变化，学生常把数词后的名词保持单数。英语可数名词与大于一的数词连用时必须变成复数形式，tomato 的复数是 tomatoes，所以 three tomatoes 才对。
grammar · medium
易错句子There are many tomatos in the garden.
正确表达There are many tomatoes in the garden.
tomato 以 -o 结尾，这类名词变复数一般加 -es（tomato → tomatoes，potato → potatoes），不能按最常规的 -s 规则写成 tomatos，这是拼写错误而非可接受的变体。
grammar · medium
易错句子My mother likes eating tomato.
正确表达My mother likes eating tomatoes.
表示泛指一类食物时，英语可数名词通常用不带冠词的复数形式 tomatoes；汉语“番茄”无形态变化，直译成单数 tomato 会被理解为某一个具体的番茄，与泛指语义不符。
樱桃番茄；圣女果
She tossed a handful of cherry tomatoes into the salad.
她往沙拉里拌了一小把圣女果。
番茄酱；番茄调味汁
The pasta is served with a rich tomato sauce.
这道意面配着浓郁的番茄酱汁。
番茄汁
He drinks a glass of tomato juice every morning.
他每天早上喝一杯番茄汁。
番茄汤
Tomato soup is a classic comfort food in winter.
番茄汤是冬天经典的暖心食物。
浓缩番茄酱；番茄膏
Add a spoonful of tomato paste to deepen the flavour.
加一勺番茄膏让味道更浓郁。
Choose the next layer that will help you use tomatoes with more confidence.
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Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.
番茄干；晒干的番茄
The bread is topped with cheese and sun-dried tomatoes.
这款面包上面铺着奶酪和番茄干。