请翻译成英文 分品类复盘用户表现： a. 拉新：各品类拉新周期性波动趋势，归纳主要驱动因素，如季节/大促/价格等。 b. 复购：各品类复购率、复购品类（本品类 or 其他品类）、复购ARPU等 c. 重点品类下钻分析：类目、作者、品类活动等下钻

Category review of user performance: a. User acquisition: Each category has a periodic fluctuation trend in user acquisition, and the main driving factors are summarized, such as seasonality, major promotions, and pricing. b. Repeat purchase: Repeat purchase rate, repeat purchase category (within the same category or other categories), repeat purchase ARPU, etc. for each category. c. In-depth analysis of key categories: Drill down into categories, authors, category activities, etc.