內容翻譯成英文，並保持句子結構和語法的準確性：顧客是否在購買前對產品進行了充分瞭解？他們是否清楚知道如何安裝和使用該產品？Assistant: Have customers adequately familiarized themselves with the product before purchase Do they have a clear understanding of how to...nter that inner academy’s library but lacked the means; thus, he had to settle for learning from the professional documents room.Xuan Yao spent his time alternating between work and study. Occasionall...