This loop will create 26 documents, one for each lowercase letter of the alphabet, each document containing the character itself and its ASCII character code.

此循环将创建26个文档，代表字母表的每个小写字母，每个文档包含字符本身及其ASCII字符码。

youdao

The unique case-mapping rules for the Turkish alphabet illustrate how uppercase and lowercase mappings differ from language to language even when they use most of the same letters.

土耳其字母表的独特大小写映射规则说明了大小写映射在不同语言之间存在着差别，甚至是在它们使用的字母大多数都相同时也如此。

youdao

You can brute force it and unfortunately, the so-called Caesar cipher is not very secure because if you assume, for our purposes in English alphabet with 26 characters, say all lowercase for all uppercase, my God, you only have to try like 24, 25, 26 possible rotations until you can figure out what his secret message is.

你可以强行解密但是不幸地是，所谓的凯撒密码不是很安全的,因为如果假设，对于我们的26个字符的字母表,指明所有的小写为大写，我的天，你只要试24，25次，26次就可以解答出,密文的内容。

哈佛公开课 - 计算机科学课程节选

Because, if there's one alphabet letter that needs to be prison-shanked and dropped into a shallow grave it's the lowercase i.

CNN: Apparently This Matters: iPotty