短语
中文翻译：免费
同义词：
['free of charge', 'gratis', 'without charge']
例句：
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1.You can use the library's computers at no cost.
你可以免费使用图书馆的电脑。
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2.The concert was free of charge for all attendees.
音乐会对所有参与者免费。
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3. We decided to go to the beach without charging our friends.
我们决定不向我们的朋友收费去海滩。