名词
中文翻译：无效货币
同义词：
['invalid coin', 'worthless currency']
例句：
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1.The government has declared that the new currency will be invalid for a year.
政府宣布新的货币将无效一年。
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2. The old currency is now considered invalid and not accepted by banks.
旧货币现在被认为是无效的，银行不接受。
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3. The country's currency was invalidated due to a sudden economic crisis.
该国因突发经济危机而使货币无效。