Grammar Note
表示“硬币”时为可数名词；泛指零钱时常用复数 coins。
硬币；钱币
先理解核心含义，再看它在真实句子里的用法。
硬币；钱币
a flat, typically round piece of metal used as money, sometimes polygonal or with a hole in the middle
I need a coin to use the vending machine.
我需要一枚硬币才能用自动售货机。
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.
She collects old coins from different countries.
她收集不同国家的旧硬币。
He flipped a coin to decide who would go first.
他抛了一枚硬币来决定谁先走。
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表示“硬币”时为可数名词；泛指零钱时常用复数 coins。
该词属于 Oxford 核心词汇，值得优先掌握常见搭配和句型。
Collins 词频等级为 1，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.