After in-depth thinking and practical connection, I think:
Threads a > A and B enter the first if judgment at the same time. B > A enters the synchronized block first, and since instance is null, it executes instance=new Singleton ();
In the above example, there is not much consideration for performance. In fact, there are some relatively large optimization points here.
Located on the southeast coast of Jinjiang, from Yongning of Shishi to Yakou of Jinjiang, Shenzhen and Shanghai form a beautiful bay, during which the beach stretches for several kilometers, like a silver necklace inlaid between the blue sky and the blue sea. In front of the beach is a vast expanse of blue waves. The beach is golden and open, and the scenery is spectacular. The sand beach is all fine and pure sand grains, such as silver scraps, with fine quality and gentle slope, and soft sand and flat tide. The beach bed is wide, stretching and expanding. The tide overflows the beach and the sound of the waves is soft. The sea water is clean and the water temperature is moderate. It is an ideal place for beach leisure, surfing and playing and carrying out various sea beach activities. Coming from the coast, the National Shenzhen-Shanghai Seabed Ancient Forest Nature Reserve,
明朝武宗正德年间，一盗匪乔装扮成北镇抚司指挥使翁泰北的模样从国库重地盗走十万两黄金，后被匪头白玉莲灭口，这一幕恰好被微服私逃出宫的天凤看到。白玉莲发现被人偷窥欲追杀灭口；天凤侥幸逃脱，并遇见长风镖局的少主郭旭。白玉莲手下自称浙江来的密使，持有总督派令，托长风镖局保送十万两黄金南下。此时皇上也秘密来到镖局，托镖局保护公主。原来公主身染不治之症，余日无多。翁泰北奉命也带着锦衣卫暗中随后护送。其间，天凤、翁泰北一行历尽艰险平安返回京城。皇帝论功行赏，长风镖局重振昔日雄风……
《倚天屠龙记》小说连载到现在，已经进入了收尾部分。
讲述了尹泰悟(珉豪 饰)、韩松伊(朴素丹 饰)、徐智安(金珉载 饰)、崔勋(李利敬 饰)、吴佳琳(赵惠贞 饰)、柳世贤(郑柔真 饰)带著各自的理由将尹泰悟独居的阁楼当成秘密根据地，以各自的方式体验人生逐渐成长的故事。
老婆死了有几年，自己又漂泊海外，寂寞孤零，老马迷迷糊糊地喜欢上了温都太太。
心智的成熟，武功的进步，让小鱼儿对人生有了新的感悟
金材昱饰演美术馆的新任馆长Ryan Gauld。高额头、高挺的鼻梁、线条明朗的颜和长腿，随风飘散的头发….他有着自带BGM的无法形容的微妙氛围。比起说是美术馆长，倒不如说是在美术馆展览的供人鉴赏的艺术作品。
唐微微（李冰冰 饰），32岁，既是设计公司的白骨精，也是大龄剩女。她的闺蜜靳小令（薛佳凝 饰）在怀孕期间，热心为她网络征婚并安排了相亲。结果，唐微微装孕妇吓跑了大多数，只剩下一个杨年华（孙红雷 饰），两人由此相识。与此同时，唐微微所在公司接了美国的客户，见面时她发现客户代表竟是7年前抛弃自己的男友王洋（段奕宏 饰）。他们从18岁开始恋爱，青梅竹马度过7年，终因王洋为理想奔波而分手。如今，昔日恋人重逢，别有一番滋味在心头。此时，杨年华却开始了一波又一波的热情攻势，无论是嘘寒问暖还是炒菜做饭，都体贴入微。而王洋也不甘示弱，意图通过忆苦思甜昨日重现唤醒唐微微重回他怀抱。于是，情敌之战，一触即发……
Submerged in blue dye, its color transitions from orange to green.
众军见玄武王来了，忙散开一条道让他进去，又都抱拳齐声道：见过王爷。
11. Stocks are very expensive and have gone up a lot, which is not the reason why you refuse to buy or sell. He may rise even higher.
你代表不了刘邦，更决定不了寡人的心思。
And that kind of repetition makes it easier to understand, the words spoken by native speakers at normal speed.
Sous Vide is French, Vacuum low temperature cooking, It is mainly aimed at meat and seafood, The production method is the same as the translation, The food materials are treated under two conditions of vacuum and constant temperature, and the meat center can slowly and steadily reach the effect of a certain temperature through long-term constant temperature heating, while the external temperature will not be too high. The purpose of doing so is to better ensure the taste of meat and achieve the sterilization effect through long-term heating and vacuum environment.
14. Do not issue a notice when the formulated plan is not confirmed. Since the plan confirmation notice is also issued to all departments, it should be implemented well. If it is not implemented for special reasons, it should be notified separately to facilitate all departments to arrange other work. Notices requiring assistance from various departments should include the main matters and the distribution of work, so as not to ask the relevant departments clearly and have no accurate answers.
解放前夕，我党特工陈少杰、黄山被派往西江执行营救被俘同志的任务，与之配合的正是先其一步来到西江秘密潜伏的乔燕，三个人相互配合，颇为默契。国民党残余势力自知大势已去，开始与土匪勾结。此时，迎来解放的陈少杰、乔燕、黄山三人又成为了剿匪工作队的得力干将，他们肩负着维护社会安定团结的任务，与大凉山地区的土匪周旋，而土匪的破坏行动一直暗潮涌动。在与这伙势力的殊死较量中，陈少杰等人一次次阻止了敌人的阴谋，这使土匪将陈少杰视为眼中钉，肉中刺，千方百计想将其铲除。最终陈少杰凭借着忠诚的信念与智慧，损毁了敌人的诡计，带领同志们将土匪势力成功歼灭。
