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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:　　《地心毁灭》是部一流电影，这个说法有双重意义。好在嬴子夜开口，及时打破了这诡异的气氛。最后，云洛带着参娃和无限的憧憬、希望，又回到了断情岭上。颜值爆表的校园女神，将带你盛夏狂欢。从8月份开启，首轮线上选拔将为期三周，随后的各地海选将设置北京、杭州、成都、西安、青岛、深圳、长春7大赛区，覆盖全国 200 多所重点高校，吸引各大高校女孩报名，更将有层层选拔等待着她们。而最终突出重围，成为全国十强的“狐友国民校花”将有望签约搜狐视频，出演自制剧，步向演艺圈。Q: Which machine learning library do you like best?町田君是家里的长男，承担了全部家务，包括照顾弟妹。 町田君是班里的学生，成绩真的很一般，文法都不太会。 町田君是个温柔的人，不假思索给予援助，这能算一项特长吗？