a coin
可数名词单数泛指时,前面要用不定冠词 a/an。
He put a coin into the vending machine.
他把一枚硬币投进了自动售货机。
筹码；代币；钱币牌；星币；圆薄片；圆片；报酬；补偿；流行事物；通用事物
a flat, typically round piece of metal used as money, sometimes polygonal or with a hole in the middle
货币单位,通常为金属圆盘状,有时呈多边形或中间有孔。
A piece of currency, usually metallic and in the shape of a disc, but sometimes polygonal, or with a hole in the middle.
用作货币的扁平金属片(通常为圆盘状)
a flat metal piece (usually a disc) used as money
赌场等特定场所使用的代币。
A token used in a special establishment like a casino.
用于支付或报酬之物。
That which serves for payment or recompense.
广泛流通或使用之物。
Something in broad circulation or use.
塔罗牌小阿卡那中的钱币花色,或该花色的一张牌。
One of the suits of minor arcana in tarot, or a card of that suit.
角落或外角。
A corner or external angle.
小圆片状食物。
A small circular slice of food.
I need a coin to use the vending machine.
我需要一枚硬币才能用自动售货机。
用法提示：coin 在这里是单数可数名词，指金属硬币，作 need 的宾语。
She collects old coins from different countries.
她收集不同国家的旧硬币。
用法提示：coins 是 coin 的复数形式，指多枚硬币，作 collects 的宾语。
He flipped a coin to decide who would go first.
他抛了一枚硬币来决定谁先走。
用法提示：a coin 是单数可数名词，指一枚硬币，作 flipped 的宾语。
可数名词单数泛指时,前面要用不定冠词 a/an。
He put a coin into the vending machine.
他把一枚硬币投进了自动售货机。
复数形式 coins 表示不止一枚,也可泛指这一类物品。
She keeps a box of old coins at home.
她在家里留着一盒旧硬币。
特指某一枚或双方都清楚的那枚硬币时,用定冠词 the。
The coin she found turned out to be very valuable.
她捡到的那枚硬币原来很值钱。
grammar · medium
易错句子I have many coin in my pocket.
正确表达I have many coins in my pocket.
coin 是可数名词，复数必须加 -s。汉语“硬币”没有词形变化，many 后面的可数名词一定要用复数形式 coins。
grammar · medium
易错句子How much coins do you have?
正确表达How many coins do you have?
coins 是可数名词的复数，提问数量要用 many；much 只能修饰不可数名词（如 money）。汉语“多少”不分可数与不可数，容易误用 much。
grammar · medium
易错句子Can you give me a piece of coin?
正确表达Can you give me a coin?
coin 是可数名词，用 a coin 即可表示“一枚硬币”。a piece of 是汉语“一枚/一张+名词”量词结构的直译，英语中只有不可数名词才需要 a piece of（如 a piece of paper），此处是多余的。
掷硬币（以决定某事）
They tossed a coin to decide who would go first.
他们掷硬币来决定谁先开始。
抛硬币（做决定）
Let's flip a coin to see who pays for dinner.
我们抛硬币来决定谁付晚饭钱吧。
金币
He found an old gold coin in the garden.
他在花园里发现了一枚古老的金币。
硬币收藏
My grandfather has a large coin collection.
我祖父有大量的硬币收藏。
事情的另一面
Living abroad is exciting, but the other side of the coin is loneliness.
在国外生活很刺激，但事情的另一面是孤独。
投入硬币
Insert a coin to start the machine.
投入一枚硬币即可启动机器。
Choose the next layer that will help you use coin with more confidence.
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Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.