The ShippingService protocol could have been specified using any UML 2 behavior: an activity, interaction, state machine, protocol state machine, or opaque behavior (code).
ShippingService协议通过使用任何UML2行为被指定，这些行为可以是：活动、交互、状态机、或者不透明行为(代码)。
The ShippingService protocol could have been specified using any UML 2 behavior: an activity, interaction, state machine, protocol state machine, or opaque behavior (code).
ShippingService协议通过使用任何UML2行为被指定，这些行为可以是：活动、交互、状态机、或者不透明行为(代码)。
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