activity contain 围阻活性
There are some activity and element nodes that can only contain activities.
存在一些只能包含活动的活动节点和元素节点。
These processes cannot contain any activity that causes them to be suspended.
这些流程不能包含任何能使他们暂停的活动。
A scope activity can contain more scope activities within it, so activities within a scope can also access variables of all enclosing scopes.
范围活动可以在其内部包含多个范围,因此范围中的活动也可以访问所有封闭范围的变量。
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