例句：
For each mistake, you'll lose half a point.
For every three people who agree, you'll find five who don't.

Who created the idea(s) of the first loop constructs?

https://softwareengineering.stackexchange.com/questions/149465/who-created-the-ideas-of-the-first-loop-constructs

For this purpose we need merely compose a series of cards according to the law required, and arrange them in suitable order one after the other; then, by causing them to pass over a polygonal beam which is so connected as to turn a new face ** for ** every stroke of the shuttle,

还可以用foreach，或者#define foreach for

https://zhuanlan.zhihu.com/p/145257752
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StackOverflow(difference between String.Empty and string.Empty)，答案是没有，在中间语言(Intermediate Language, IL)层也没有。 string是System.String的别名(alias)。string.Empty倒是不需要import System.

""呢？"Use whatever you and your team find the most readable."是被赞最多的答案。

Other answers have suggested that a new string is created every time you use "". This is not true - due to string interning, it will be created either once per assembly or once per AppDomain (or possibly once for the whole process - not sure on that front). This difference is negligible - massively, massively insignificant.

String Interning is a method of storing only one copy of each distinct String Value, which must be immutable.

intern - 实习生。做动词：put someone in prison without charging them with a crime, for political reasons or during a war，关进监狱就改不了了。

https://zhuanlan.zhihu.com/p/145629853
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