1.Orchestration或者Scope如果具有事务特性，那么可以设置timeout.
2.Parallel Action中各个branch间如果涉及到对同一个变量的读写，需要把同步属性设置为true。
3.A line of code in an Expression shape will not be interrupted by either an exception in a parallel branch or a TimeOutException arising from a timed-out scope.
4.A Delay shape or Receive shape, etc. will be interrupted by either an exception in a parallel branch or a TimeOutException arising from a timed-out scope.
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