通常我们用符号s来表示弧长。
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.)
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.
我不知道为何要用s来表示弧长，这只是一个常用的符号。
I'm not quite sure how you get an out of this, but it's the usual notation.
如今情人节的象征符号包括心形图案，鸽子，以及长有翅膀的丘比特。
Valentine's Day symbols that are used today include the heart-shaped outline, doves, and the figure of the winged Cupid.
由于盲信道估计算法复杂度高，收敛时间长且存在信号或符号的不确定问题，不适于在实际中应用，因此本文主要研究的是基于导频的信道估计。
Because of the high algorithm complexity, the slow convergence and the signal or symbol obscure problem of the blind channel estimation, it is not suitable in practical use.
无符号长整型数，它给出输入字符串的IL偏移量，或在没有IL偏移量或字符串格式不良时给出零。
Offset Unsigned long integer giving the IL offset from the input string, or zero if there was no IL offset or the string was not well formed.
是无符号的长一样有效，在C无符号长吗？
会发生什么事无符号长具有更多的位是，不是所有的都是1。
What happens when unsigned long has more bits is that not all of those are 1.
如果你在你的表达式中用到ul(表示无符号长整型)，那么你有了一个好的起点。
If you in your expression used UL (said unsigned long integer), then you have a good starting point.
破折号比连字符号长些。
破折号比连字符号长些。
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