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.

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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?

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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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