通常我们用符号s来表示弧长。

So, the usual notation that we will have is for arc length.

youdao

其种类很多，但基本的理念是在变量名的开始添加一个标记以表示其类型（例如，所有无符号长型变量都以 ul 开头）。

There are lots of flavors of this, but the basic idea is that you put a tag at the beginning of a variable name saying what type it is. (So all unsigned long variables begin with ul, etc.)

youdao

换言之，没有美元符号锚定字符串的结尾，带有匹配前缀（例如 “martin1234-cruft”）的非常长的字符串将生成误判 (false positive)。

In other words, without the dollar sign to anchor the end of the string, a very long string with a matching prefix, such as "martin1234-cruft," would yield a false positive.

youdao