這就是符號學！ 探索日常用品、圖像、文本，76個人人都能讀懂的符號學概念 (二手書交易資訊)

[{"sale_price":300,"disc":"55","prod_count":1,"sale_month":"202009","avg_price":300,"avg_disc":55},{"sale_price":239,"disc":"43","prod_count":1,"sale_month":"202011","avg_price":239,"avg_disc":43},{"sale_price":560,"disc":101,"prod_count":2,"sale_month":"202012","avg_price":280,"avg_disc":51},{"sale_price":590,"disc":107,"prod_count":2,"sale_month":"202101","avg_price":295,"avg_disc":54}]