1·I say "sideways" because they provide a way to express meanings "on the side," without complicating the program's logic, and without requiring an object-oriented approach.
我之所以称之为“侧面的”,是因为它们用“另外”的方法来表达含义,不需要使程序的逻辑变得复杂,也不需要面向对象的方法。