Question: We lost the 6th book in the series. After two months, we finally found it…
问题:我们丢失了系列中的第六本书。两个月后,我们终于找到了…

Answer: Flip over the ninth book
答案: 把第九本书倒装
Question: We lost the 6th book in the series. After two months, we finally found it…
问题:我们丢失了系列中的第六本书。两个月后,我们终于找到了…
Answer: Flip over the ninth book
答案: 把第九本书倒装