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:
腊月二十九这天，板栗和刘井儿带着冬子骑马出谷，半途中又叫上万元，直奔田上酒家。
卫斯理，一个一生中充满传奇的人，他经历过许多不可以用科学来解释的古怪事，他相信有鬼神，也相信有外星人存在，因为他觉得如果宇宙间只有地球人，岂不是太寂寞吗？在寻找真相的寂寞旅途上，上天终于安排了一个伴侣给卫斯理，她就是与卫斯理性格刚好相反，凡事以科学角度去分析、讲求证据真相、为人理性的白素……
2. Integration and commonality of celebrity endorsements. As an enterprise's brand, there will be development, brand expansion and different spokesmen. Spokesmen should be selected from the long-term plan of brand building and pay attention to identity. The shaping and maintenance of brand image should consider the long-term nature of the overall brand image while considering the phased objectives of brand development.
Season 3, Episode 5: The Man with the Twisted Lip《歪唇男人》6 August 1986
抗战打响，日军封锁我国运输路线，危急时刻神鼓滇缅公路撑起了抗战的后勤补给，这条神奇的公路自建成时就书写了一幕幕传奇。由于急缺司机和技工，来自南洋的三千余名华侨毅然归国，不顾前途艰险，共赴国难。方家兄弟是这些华侨中的典型。大哥方万海表面上是一个投靠日军的汉奸，实际上却是中共潜伏在日军内部的地下工作者；方万海委曲求全，忍受着所有亲人和朋友的误解，为了自己的信念，在生死之间游走。弟弟方千树本是纨绔子弟，对祖国的观念很是单薄；然而在战火中，方千树看着一个个好友在日军的轰炸下惨死、在疾病的痛苦中离世，这让方千树心中感到了无比的震撼，让他明白：为了民族和国家的希望，他要重新找寻前进的方向和生命的意义
2. It is very difficult to win the competition only by using some mature methods, especially in the in-depth learning competition, so we need to give more creative solutions;
允许女子投军，乃是全孝道、安邦定国。
The earliest measurement division of 12 units and 60 units came from Sumerians in Mesopotamia between the Euphrates and Tigris rivers between 4000 BC and 2000 BC, who created the first high civilization of mankind. The invention of wheels and cuneiform characters divided the whole into 12 units (12 months a year, the concept of "one dozen") and 60 units of measurement system (minute hand)
今日不是初一、十五，所以香客并不多。
杨长帆摊开双臂冲二人道，收寡货郎，衣冠禽兽，现在是全县首富，而咱们这些穷人，也只是变着法子暗地骂他，什么都做不了。
…,子房先生突然请罪，让刘沛公措手不及。
永平帝激动万分，抬手道：玄武候，白虎将军，朱雀将军，玄武将军平身。
这一交手，尹旭立即把握到黑影的招式动作轻巧灵敏，力量却比自己差的远。
这是一部描写从小就是仇家的一对男女和他们周边的亲人，朋友的爱情故事。有人说想要幸福就去谈恋爱，也有人说想要幸福，就不要去谈恋爱。也许就是这个原因，千古以来，爱情就是人们一直谈不完的话题。这部电视剧就像一本充满回忆的旧相册，外表破旧，但翻开时里面却是灿烂的阳光。
"Mice belong to rodents. It is indeed their natural nature to be good at digging holes and drilling the ground, but how efficient is it to use this skill to avoid fire on the spot?" I still couldn't believe it, so I continued to ask.
尹旭轻轻摇头道：故人之子，自然厚待。
The Second World War was the war with the largest number of casualties in history, with a total of 55-60 million dead and 130 million injured, totaling 190 million dead and injured. The following are the casualties in major countries:
System.out.println ("observer1 has received! ");
《周六夜现场》（Saturday Night Live）是一个每周六深夜播出、60多分钟的美国综艺节目，以纽约市为拍摄地，自1975年10月11日由NBC播出，是美国电视史上最长寿的节目之一。每周都有不同的客座主持人与音乐来宾加入，与该节目的固定卡司一同演出。表演嘉宾会参与到小品的表演中，往往能让人看到该嘉宾不同的一面，并且这样的喜剧表演也是其演技的试金石。而音乐嘉宾通常是当下当红的歌星，会进行现场表演。它最大的特点是结合当下最热点话题，用恶搞的小品来针砭时事，可以视其为流行文化的一面镜子。由于播出时间段较晚，所以尺度相对一般美剧会稍微大一点，恶搞的笑料从来不缺乏话题。
