A contract is any service or behavior of an object that other objects can request.

一个契约是其它对象可以请求的一个对象的任何服务或者行为。

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Create client implementation to gather and transfer the request object to the simulator service.

生成客户端实现以收集请求对象并将其传递给模拟器服务。

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The request object is then sent to the service, that then returns a TwoWayResponse object.

然后把请求对象发送给服务，并返回一个TwoWayResponse对象。

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The request object is then sent to the service, that then returns a TwoWayResponse object.

然后把请求对象发送给服务，并返回一个TwoWayResponse对象。

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