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中文Workbooks can be sold individually (either for free or at a fee), and they can also be associated with courses. Currently, they support association with text and image courses, audio courses, video courses, live courses, columns, major columns, membership co...

English练习本支持单独售卖（免费或付费），也可以关联课程，目前支持关联图文、音频、视频、直播、专栏、大专栏、会员课程、班课。