The Liskov Substitution Principle (LSP) is one of the basic principles of object-oriented design. The Richter substitution principle says that wherever a base class can appear, subclasses can certainly appear. LSP is the cornerstone of inheritance reuse. Only when derivative classes can replace base classes and the functions of software units are not affected can base classes be truly reused, and derivative classes can also add new behaviors to base classes. The Richter substitution principle is a supplement to the "open-close" principle. The key step to realize the "open-close" principle is abstraction. The inheritance relationship between the base class and the subclass is the concrete realization of abstraction, so the Richter substitution principle is the specification of the concrete steps to realize abstraction. --From Baidu
Since the outbreak of the debt crisis at HNA, the reporter learned a number of exclusive information about HNA's real estate, aviation and internal structure changes through in-depth interviews, and published several articles that had a great impact on HNA, reflecting the breakthrough ability of the interface in reporting major commercial events.
“少年007”剧集《少年间谍》(AlexRider)正式获续订第2季。来自Amazon旗下的流媒体IMDbTV，制作方为EleventhHour、索尼影业电视部。
你们还要不要逼脸了，《天河魔剑录》电视剧是你们家紫月剑拍摄的？你们别得意，我们的《白发魔女传》和《笑傲江湖》迟早也会拍成电视剧。
Subsequent results
On July 14 this year, I took part in the practical activities in the countryside of Guangzhou University. The activity was held in Yayao Town, Huadu District, Guangzhou City.
半夜12点，街边一家BAR的灯牌亮了起来。三名美男子吵吵闹闹地准备开业。他们都是来自“喵星球”的喵星人，为了完成使命，白天是猫，晚上变成人。他们每晚在酒吧倾听客人的心事。用他们特别调制的鸡尾酒，让客人在意想不到的时间旅行中得到了治愈。
名噪京师的烤鸭老字号“福聚德”创业于清同治年间。传至民国初年，老掌柜唐德源因年迈多病而退居内室，店业全仗二柜王子西协助两位少掌柜惨淡经营。怎奈两位少爷与鸭子无缘，闹得店铺入不敷出，王子西几次向老掌柜推荐他的换帖兄弟卢孟实来操持店业。生性聪慧的卢孟实立誓要干出一番事业来，以泄人间不平。面对势如垒卵的“福聚德”，他绞尽了脑汁，结果在不长的时间里竟使这三间老屋翻盖起了二层楼。光阴荏苒，十年一晃而过，“福聚德”名噪京华。此时，唐家的两位少爷在流言蜚语的怂恿下，却与卢孟实争起了东主财权，经过一些列纷争之后，精明而无奈的卢孟实明晰人间事理，便离开“福聚德”回山东老家去了……
Only for users in Suzhou Industrial Park, Xiangcheng District and Zhangjiagang to apply for free charging certificate business:
This is the classic synchronous blocking I/O mode of one thread per connection.
CBS已续订《夏威夷特勤组》第七季。
抬头细看时，不觉有些惊艳，俗话说女要俏，一身孝。
芝加哥警署第21辖区分为两个部分，包括直接打击犯罪的行动组和负责调查城市之中犯罪团伙的情报组。汉克（杰森·贝吉 Jason Beghe 饰）是情报组的组长，他嫉恶如仇，将打击犯罪当做自己义不容辞的首要任务，在他英明果断的决策下，许多穷凶极恶的犯罪分子一一落网。
The fifth-year residents return for the first day of a year that will make or break their careers: Meredith faces the consequences of tampering with Derek's clinical trial and is terminated at the hospital; April tries to step up to the plate as Chief Resident in the wake of a giant sinkhole in the middle of Seattle; and Cristina and Owen are still at odds over their drastically different feelings for their unborn child.
Let's analyze it first. Judging from the above default situation, it is not enough to study only a single event for the event mechanism. It depends on how each event in the whole event sequence is handled. Therefore, the following situations need to be considered when studying event consumption:
2, character attribute relationship ratio.
《神奇校车》是美国国家图书馆推荐给所有学龄前儿童和小学生的课外自然科普读物，是全美最受欢迎的儿童自然科学图书系列之一。1994年，美国Scholastic集团将其改编成动画片推上银幕。在一次次不可思议的神奇之旅中，让孩子们体验原理、学会操作、懂得思考、爱上科学。
