自定义属性在已经为任务实例进行了设置之后可用，或在任务模板上进行设置的情况下，在所有任务状态下可用。
Custom properties are available after they have been set for the task instance, or in all task states, when they are set on the task template.
它可以利用每个请求的服务实现可用的现有上下文作为理解所要遵照的计算器状态的一种方法。
It could take advantage of existing context that is available to the service implementation on each request as a means for understanding the calculator state that is to be acted upon.
某个单独的软件组件提供的服务在某个时段内不可用，并且服务实现必须通过手动交互接管。
A service provided by a separate software component is unavailable for a certain time period, and the service implementation has to be taken over by manual interaction.
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