The observer mode defines a one-to-many dependency relationship, allowing multiple observer objects to monitor a certain topic object at the same time. When the state of this topic object changes, all observer objects will be notified so that they can automatically update their behaviors. The specific structure diagram is as follows:
Barefoot squat, weightlifting squat should also be OK?
春秋年间，淹城城主伯淹(丁勇岱 饰)向郑王寻求治国之道却一直没有回音。突然一位名叫公孙宇(程皓枫饰)的年轻人自称是郑国王孙出现在了淹城。公孙宇在淹城边境的桑树墩识破罗敷(舒畅饰)就是淹城公主的身份，并在吴越两国挑衅桑树墩的事件中，机智的救回了公主，巩固了自己在淹城的地位。但是公孙宇只是越国大夫范蠡“兴淹治吴”策略的一步妙棋。真正的王孙，已经带着郑王给伯淹的回信葬身山谷了。
刘邦现在可是有种深深的无奈，想当初在关中结盟的时候，尹旭信誓旦旦的保证，会给自己推荐人才
I will never forget it. "Zhang Xiaobo said.
The bizarre animated escapades of pseudo-heroic scientist Dr. Rusty Venture, his competent, high strung bodyguard, and his two over-enthusiastic sons.
年轻有为的景观设计师杨真真得知未婚夫葛天和另一个热爱赛车的女子秦若云一起死在赛车途中，她困惑葛天为何选择了与那个女人同生共死。她开始对赛车世界感兴趣，而秦若云的哥哥秦若飞帮助她进入了赛车世界。
2008年，落魄的电竞老将肖枫勉强维持着自己的战队。此时电竞还远没有迎来它最好的时代，肖枫的战队被误解、被嘲笑，却坚持着心中的梦想。
欢乐喜剧人第6季更多幕后花絮，尽在会员独享版。
于是，大战再起。
At 9:34 a.m. on October 15, the Beijing News published a report that "Shanxi 24 Teachers' Dinner Continued by Informed Criticism: Secretary of the County Commission for Discipline Inspection Dismissed". It said: On October 14, Tunliu County officials responded to the incident by saying that the above-mentioned informed criticism was a wrong decision made by the County Commission for Discipline Inspection on a subjective and mechanically applied basis. At present, drawer Shigui has been removed from the post of secretary of the Discipline Inspection Commission according to procedures and the county Discipline Inspection Commission team has been reorganized. In addition, the new team of the Commission for Discipline Inspection, together with the County Public Security Bureau and the Education Bureau, will reconsider and determine the reasons and sources of funds for the dinner of teachers in Tunliu County No.1 Middle School.
The re-emergence of underground services specializing in payload manufacturing highlights the fact that:
LIONS车队外有强大的对手宋杰，内有亟需解决的误会与冲突。在激战的赛场上，他们重新找回初心，再次叱咤风云。
练霓裳和卓一航的这段爱情中，其实卓一航付出的一点也不少。
天启老师，我最喜欢你的武侠了。
Figure 1 Number of Overseas Control Ends Launching DDoS Attacks This Month by Country or Region
林海能预料，小鱼儿以后的武功未必不会超过花无缺。
只要当着人的面拜了堂、成了亲，就必须得认？老臣威严地说道：老夫绝无此意，尔不可断章取义。
好容易安排妥了，板栗尚未喘口气，刘黑皮便来催促：时辰快到了，该出发迎亲了，内院来人请王爷赶紧去换吉服。
Although it can weaken the connection between objects, if it is overused, it will make the code difficult to understand and maintain, etc.
