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In the previous example of electric lights, a state mode program was completed. First, the Light class is defined, which is also called Context here. Then in Light's constructor, to create instance objects for each state class, Context will hold references to these state objects in order to delegate the request to the state objects. The user's request, that is, the action of clicking button, is also implemented in Context, with the following code:老师——这一人类灵魂的工程师，一个平凡而伟大的职业。在中国九百六十万平方公里的广袤土地上，奋斗着无数个兢兢业业的“灵魂导师”。特别是大多数的乡村教师，拿着微薄的收入，却付出自己全部的心血与汗水。为了让每一个孩子能多识一个字、多读一天书，一步又一步的奔走在崎岖的山间小路上。可是纵观中国的电视剧历史，对他们的描述却是少之又少，电视剧《鸳鸯河》的立意正是在此，通过对南方某乡村老师一生对教育事业的执着与坚持，为观众描画了一幅中国教育发展史的壮美画卷。戚夫人不是刘邦的专房贵宠吗？戚夫人不是粘着刘邦，还生了赵王如意吗？面前的戚懿儿却不喜欢刘邦。《英雄》的主要演员是一群实力派演员。扮演燕双鹰的张子健，扮演大莲的王昌娥和扮演沈七七的胡晓光，都毕业于北京电影学院。这些演员在表演上分寸感把握得特别好，都很会控制自己，把剧中人物神秘、超乎常人的特点发挥得淋漓尽致。Can access relevant databases and report systems so as to make real-time diagnosis and treatment decisions;