如果是这样，客户端和服务就可以交换包含ite m子类订单的子类。
If so, the client and service could exchange subclasses of Order containing subclasses of Item.
使得客户端和数据服务中心通过无线网络实现数据的传输和交换。
The client and data service center through wireless network realization the data transmission and exchange.
使得客户端和数据服务中心通过无线网络实现数据的传输和交换。
The client and data service center through wireless network realization the data transmission and exchange.
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