<正> In the Yuan Dynasty,Shang Ting wrotein a poem,“Facing my dim lamp,I long foryou a,thousand li away;Whom should I ask todeliver my brocade letter? Wild geese seldomarrive;Flowers fade and fall;And you,too,are thin and worn.I pine for your return.How many tears have I shed?”There are two allusions in the lines,“Whom should I ask to deliver my brocadeletter?”and“Wild geese seldom arrive.”“Brocade letter”means a letter written by