高容量的应用程序也是独有的，因为它们一般消耗大量的CPU或内存资源。
High volume applications are also unique in that they typically consume large amounts of CPU or memory resources.
利用网络上某处(在“云”之中)的资源，计算能力将会变成一种应用程序并像一般服务一样提供给用户。
This enables computing power to become a utility: it is generated somewhere on the network (" in the cloud ") and supplied as a service.
比如数据库连接池就是单例设计模式的一个例子：我们一般不想让应用程序具有连接池类的多个资源密集型实例。
An example use case for a singleton would be a database connection pool: you don't want your application to have multiple resource-intensive instances of a connection pool class.
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