名词
中文翻译：硬币
同义词：
['coin', 'currency', 'denomination']
例句：
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1. The old man kept a collection of rare coins in his house.
这位老人在他的房子里收藏了一些稀有的硬币。
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2. The bank issued new coins to replace the old ones.
银行发行了新的硬币来替换旧的。
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3. He counted all the coins in his pocket and found out he had lost some.
他数了一下口袋中的硬币，发现丢了一些。