名词中文翻译
中文翻译：免费硬币兑换
同义词：
['Free coinage', 'Free coinage system']
例句：
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1.The government is considering a free coinage system to encourage people to use public transportation.
政府正在考虑一个免费硬币兑换系统，以鼓励人们使用公共交通。
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2.The free coinage system has been a great success in reducing pollution and congestion in the city.
免费硬币兑换系统在减少城市污染和拥堵方面取得了巨大成功。
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3.The free coinage system has also raised awareness about environmental protection among the public.
免费硬币兑换系统也提高了公众对环境保护的意识。