子程序这章主要针对新的语法(原型和属性)，以及左值属性(5.6.0)。
The subroutines chapter covers new syntax (prototypes and attributes), plus the brand new lvalue attribute (as of 5.6.0).
连左脸也转过来，在路加第六章29节有，但多数人只知道它出自马太第五章39节。
Turn the other cheek, that's also in Luke 6:29, but most people know it from Matthew 5:39.
在第二章中我们首先定义了左拟对偶双边模。
左斜带：从饰有纹的盾章的左上角到右下角的带子。
Bend sinister: a band passing from the upper sinister corner of an escutcheon to the lower Dexter corner.
左斜带：从饰有纹的盾章的左上角到右下角的带子。
Bend sinister: a band passing from the upper sinister corner of an escutcheon to the lower Dexter corner.
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