使用模板方法实现中介模式的桥接角色，这种做法提供了一种可以在将来添加外部通信备用类型的机制。
Using the template method for implementing the bridge role of the broker pattern provided a mechanism for adding alternative types of external communication in the future.
自动桥位采用双剪切设计，无须更换剪切刀，附有备用装置。
Double cutting design is applied to automatic bridge site, no blade changing, with prepared device.
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