复数类的实现，这个程序的主要功能就是实现复数的相加等操作。

The plural types of implementation, this procedure is to achieve the main function of the additive, such as the plural operation.

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Ruby on Rails强化了类是单数而表是复数的概念，这减少了程序员的工作量。

Ruby on Rails enforces the notion that classes are singular, and tables are plural. This reduces the amount of work programmers need to do.

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注意：类名区分大小写，并且模型名是单数，控制器名是复数。

Remember they are case sensitive and model names must be singular (controllers must be plural).

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