局限性显而易见，设备本身实质上没有什么扩展的选项，除了播放媒体之外，它几乎没有其他用途。
The obvious limitation is simply that, because the device itself has essentially no expansion options, there's not much you can do with it other than make it play media.
实质上插件并不能试图实例化插件类本身。
It is essential that the plug-in does not attempt to instantiate the plug-in class itself.
您现在可以将 WebSphere MQ 的访问权限添加此服务，实质上是向异步协议打开此服务，尽管服务操作本身是以同步方式实现的。
You will now add access over WebSphere MQ to this service, essentially opening it up to an asynchronous protocol, even though the service operation itself is implemented synchronously.
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