大多数变量和函数应以小写字母开头。

Most variables and functions should start with a lower case letter.

youdao

如果想要引用一个字母或词语而不是变量，请使用引号将其括起来。

If you want to refer to a letter or word rather than a variable, enclose it in quotes.

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字母是变量，所以使用之前必须先为其赋值。

Letters are variables, so you must assign a value to them before you use them.

youdao

We'll actually see it's a wonderful way of effectively looping yourself back around, for instance if you're at the end of the alphabet So what about those variables?

如果我们要将某些东西首尾连在一起,在这个圈里循环，你就会看到它的奇妙之处了，譬如,你在字母表末,好，我么继续，这些变量都是些什么？

哈佛公开课 - 计算机科学课程节选

Well, get string again is returning the address of the string the user typed in, D the address of the very first character like the letter D and storing that address in this variable s1.

好的，GetString返回的是,用户输入的字符串的地址，第一个字符的地址，比如字母,然后把这个地址存储在这个变量s1中。

哈佛公开课 - 计算机科学课程节选