类决不会在网页的标记中声明，严格地讲，它是一个执行后台任务的工作者对象。
Class is never declared in the markup of a page; it is strictly a worker object that performs background tasks.
向执行组的部署将作为后台任务运行，部署进行的同时您也可以执行其他操作。
Deployment to the execution groups will take place as a background task, letting you perform other operations whilst the deployment takes place.
同样，终结通常是后台任务，所以它们常常在系统的空闲时间执行。
Likewise, finalizers are normally processed as a background task, so their cost is usually amortized across the system's idle time.
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