调用活动仅调用另一个服务的操作。
An invoke activity simply calls an operation on another service.
代理流程包含一个接收活动，后面跟着一个调用活动，以及一个仅当该流程提供的操作是双向操作时才需要的应答活动。
The process contains a receive activity followed by an invoke activity, and a reply activity that is needed only if the operation offered by the process is a two-way operation.
补偿服务需要一个操作来还原调用活动的 forward 服务所做的改变。
The compensation service needs to be an operation which reverses the changes done by the forward service of the Invoke activity.
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