它指出了在这些角色之间涉及某些交互作用的协议。
This indicates that the protocol involves some interaction between these roles.
ShippingService 交互作用指定了订货方运送方角色之间交互的行为的或者动态的方面。
The ShippingService interaction specifies the behavioral or dynamic aspects of the interaction between the orderer and shipper roles.
Trace Interaction工具的实现扩展了这个定义，推广了进行交互作用的角色，和交互作用的含义。
The implementation of the Trace interaction tool extends that definition to one that generalizes actors of interactions, as well as their means.
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