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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.

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。

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A WLAN communication system ACTS as an alternative to wired LAN and is generally used within a building.

WLAN通信系统作为有线lan以外的另一种选择一般用在同一座建筑内。

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Augmentative and alternative communication ( AAC).

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There will need to be stockpiles of fuel, generators, and alternative communication methods, since a worst-case scenario might include not only an eruption but also quakes and subsequent damage that could severely disrupt TV, Internet, radio, etc and hamper relief efforts in many ways.

FORBES: What Can Be Done To Mitigate The Effects Of The Looming Mt. Fuji Eruption?