每一项被提供的操作都能够拥有一个方法行为：活动、交互作用、状态机、或者不透明行为(代码)。

Each provided operation can have a method behavior that is an activity, interaction, state machine, or opaque behavior (code).

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然而，这只是一个选择问题；我们可以使用交互作用或者状态机。

However, this was simply a matter of choice; we could have used an interaction or state machine.

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要进行正确的电子商务对话，交互作用必须是异步的和有状态的。

To conduct proper e-business dialogues, the interactions must be asynchronous and state-ful.

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