a cucumber
cucumber 是可数名词，单数前通常用 a/an。
I bought a cucumber at the market.
我在市场买了一条黄瓜。
黄瓜
葫芦科的一种藤本植物,黄瓜；黄瓜属的瓜藤；自古栽培,结圆柱形绿果。；这种植物的可食用果实,绿色外皮,内部白色脆嫩；圆柱形绿色蔬菜,皮薄肉白,属瓜类。；黄瓜；[医] 黄瓜
cucumber
葫芦科的一种藤本植物,黄瓜
A vine in the gourd family, Cucumis sativus.
黄瓜属的瓜藤；自古栽培,结圆柱形绿果。
a melon vine of the genus Cucumis; cultivated from earliest times for its cylindrical green fruit
这种植物的可食用果实,绿色外皮,内部白色脆嫩
The edible fruit of this plant, having a green rind and crisp white flesh.
圆柱形绿色蔬菜,皮薄肉白,属瓜类。
cylindrical green fruit with thin green rind and white flesh eaten as a vegetable; related to melons
I sliced a fresh cucumber for the salad.
我切了一根新鲜黄瓜做沙拉。
用法提示：cucumber 是名词，指黄瓜，在句中作宾语。
Cucumbers grow best in warm, sunny weather.
黄瓜在温暖晴朗的天气里长得最好。
用法提示：cucumbers 是名词复数，表示黄瓜，作主语。
She bought two cucumbers and some tomatoes at the market.
她在市场买了两个黄瓜和一些西红柿。
用法提示：cucumbers 是名词复数，指黄瓜，作宾语。
cucumber 是可数名词，单数前通常用 a/an。
I bought a cucumber at the market.
我在市场买了一条黄瓜。
复数形式直接在词尾加 -s。
These cucumbers are fresh.
这些黄瓜很新鲜。
cucumber 可用作定语修饰名词，表示“黄瓜做的”或“与黄瓜相关的”。
She made a cucumber salad for lunch.
她午餐做了一份黄瓜沙拉。
非正式口语用法，多见于美式英语；在正式写作、菜单、菜谱或科技表述中应使用 cucumber。
grammar · medium
易错句子There are three cucumber on the table.
正确表达There are three cucumbers on the table.
cucumber 是可数名词，表多个时须加复数后缀 -s。中文没有复数变化，容易漏，three 后面必须用复数 cucumbers。
grammar · medium
易错句子How much cucumbers do we need for the salad?
正确表达How many cucumbers do we need for the salad?
cucumber 是可数名词，询问可数事物的数量要用 how many；how much 用于不可数名词，不能和可数复数搭配。
grammar · medium
易错句子Cucumber are widely grown in China.
正确表达Cucumbers are widely grown in China.
泛指整类黄瓜时通常用复数形式 cucumbers 作为复数主语，谓语用 are；单数 cucumber 作主语时谓语应用 is，不能直接搭配 are。
cucumber 指黄瓜，是一种常作蔬菜食用的瓜；melon 指甜瓜、哈密瓜等果瓜，多为水果。不要因二者都含“瓜”而混用。
cucumber 和 zucchini 外形都是绿色长条形，但 cucumber 通常生吃或凉拌，zucchini 常炒食或烤食，味道和做法不同。
cucumber 指新鲜的黄瓜，pickle 指经过腌渍的黄瓜或其他泡菜。点餐时若说“pickle”通常指腌制品而非新鲜黄瓜。
镇定自若；非常冷静
He stayed cool as a cucumber during the interview.
他在面试期间非常冷静。
黄瓜沙拉
I made a cucumber salad for dinner.
我晚餐做了一份黄瓜沙拉。
腌黄瓜
These pickled cucumbers are delicious.
这些腌黄瓜很好吃。
黄瓜片
Put cucumber slices on your eyes to reduce puffiness.
把黄瓜片放在眼睛上可以消肿。
黄瓜水（用黄瓜浸泡调味的水）
The spa served cucumber water to its guests.
这家水疗中心为客人提供黄瓜水。
沉着冷静，泰然自若
She remained as cool as a cucumber during the interview.
她在面试期间始终保持冷静。
黄瓜应该切成薄片，用胡椒和醋调味，然后扔掉，因为毫无用处。
This humorous line by the English writer Sydney Smith makes fun of the cucumber as a food that is all style and no substance; it is often quoted to criticize things that are overrated.
这句幽默名言出自英国作家西德尼·史密斯，取笑黄瓜作为食物有名无实，常被引用以讽刺被高估的事物。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.
黄瓜三明治
She served cucumber sandwiches at the tea party.
她在茶会上端上了黄瓜三明治。