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"Then you mean, in the subsequent battle with the" killer bee ", you still rely on the guns in your hands? If so, what effective means do you have to persist in fighting?" I asked.周菡环视众人难看的脸色，冷笑道：本姑娘也不跟诸位多费唇舌。凯叔讲故事是一个专门给孩子讲睡前故事的微信公众号。凯叔名叫王凯，是一名自媒体人。凯叔讲故事，不止讲给孩子的故事，对于大人来说，同样是一种童年的回忆。新年期间马上就要结束了，大家抓紧吃好玩好。尹文倩不说话，只是可怜兮兮的看着吴琳琳。In the system, the client often needs to interact with multiple subsystems, which causes the client to change with the change of subsystems. At this time, the appearance mode can be used to decouple the client from each subsystem. Appearance mode refers to providing a consistent facade for a group of interfaces in the subsystem. It provides a high-level interface that makes the subsystem easier to use. For example, the customer specialist of Telecom can let the customer specialist complete the services such as charging telephone charges and modifying packages without interacting with various subsystems by himself. The specific class structure diagram is as follows: