发送一些秘密信件给你干侦察工作的朋友,你的朋友在解读它们的时候要用反光镜而不是放大镜。下面介绍两种必须用反光镜解读的密信写法: 统计一下,看看字母表中都有哪些字母可以平分成相同的两半——与镜子成像一样。有些字母可以上下分 Send some secret letters to your friends who are doing reconnaissance work. Your friends use mirrors instead of magnifying glass when reading them. Here are two examples of secret letter writing that must be interpreted with mirrors: Count it to see which letters in the alphabet can be equally divided into the same two halves—like mirror images. Some letters can be divided up and down