While these things certainly are nice and make the world a cheerier place, there's actually isn't any such thing as a truly selfless act.
毫无疑问，这些举动是美好的并且可以使这个世界变得更美好，但是实际上没有任何举动是纯无私的。
The nice thing about a module is that you can attach its functionality to any existing Ruby class, and you can attach as many as you want.
关于模块的一个好处就是可以将其功能附加到任何已有的ruby类，并且可以根据您的需要添加，没有数量限制。
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