A well-written riddle.

來源: 於 2014-08-24 14:53:03 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

It is a well-written riddle. Unfortunately, I could not figure it out. I will wait for your answer to the riddle.

By the way, how are you doing? Are you still busy with your online classes?