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Yes, 新概念英语.全四册.精装美音版 is free to download, however it contains in-app purchases or subscription offerings.
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新概念英语.全四册.精装美音版 has several in-app purchases/subscriptions, the average in-app price is $3.99.
To get estimated revenue of 新概念英语.全四册.精装美音版 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.