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State mode refers to allowing an object to change its behavior when its internal state changes. The object seems to have modified its class. Divide this sentence into two parts by commas. The first part means to encapsulate the state into a separate class and delegate the request to the current state object. When the internal state of the object changes, different behavior changes will be brought about. The second part is from the customer's point of view, the object used has completely different behaviors in different states. The object seems to be instantiated from different classes, but in fact this is the effect of using delegates.小鱼儿做到了。Mild diffuse simple goiter is qualified.经过近一年的筹备和精心遴选，昨日，完美世界影视文化有限公司联合北京金盛信马影视文化有限公司宣布，由滕华涛监制的《失恋33天》电视剧正式走上轨道，主要演员尘埃落定：姚笛和张默分别饰演“黄小仙”和“王小贱”。据悉，电视剧将用33集的篇幅展现33天的“后失恋人生”，预计于2013年下半年和观众见面。滕华涛表示：“我们的目标就是让观众一次性过足"失恋瘾"。”他认为，有了“前世今生”的王一扬（王小贱）和黄小仙，形象会更佳。而姚笛和张默饰演的“黄小仙”和“王一扬”还会延续大家所熟悉的语言风格和人物形象，黄小仙的刻薄，王一扬的语不惊人死不休，只会多不会少。那么，相比文章、白百何，姚笛和张默的组合能否得到观众的认可呢？滕华涛表示：“希望观众也能认可！”　　升学的压力和独立的个性会发生怎样的碰撞？懵懵懂懂的学生们如何一次次成长？含辛茹苦的家长又是如何喜上眉梢？师生们如何快乐工作，快乐学习？整部情景剧中不仅有涉及等课堂内外的师生互动场景，触动广大观众的校园情怀，遍布笑点泪点；更有当下话题热点，如艺考、自主招生等教育热点；另外还有父母亲子之间围绕学习与升学的酸甜苦辣小故事，情节新颖又富有想象力。This is like subscribing to the "China Youth" newspaper in the post office for one year. If the post office has a new "China Youth" newspaper, it will deliver a new "China Youth" newspaper to your mailbox. If you don't subscribe to it in one year, then the post office won't send you newspapers.