必须首先启动服务包，然后启动客户端包。
You have to first start the service bundle and then the client bundle.
真正的问题是，客户端包如何知道注册的服务包？
The question really is, how does the client bundle know about the registered service bundles?
start() 方法在注册中心注册 OrderService 组件，以供客户端包使用。
The start() method registers the OrderService component in the registry for the client bundle to use.
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