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Is to define a main method calculate in the AbstractCalculator class, calculate () calls spilt (), etc. Plus and Minus inherit the AbstractCalculator class respectively, and implement the call to subclasses through the call to AbstractCalculator, see the following example:巍巍皇城，紫气东来。贾史王薛四大家族，尽享泼天财富，却不知富贵终有尽，屋子沉湎于纸醉金迷之中，不愿苏醒。在荣国府，含玉而生的公子哥贾宝玉（杨洋 饰）与好姐妹们无忧无虑地成长，吟诗作赋，猜谜烹肉，兼带诌些感时伤怀的矫情文字。他与妹妹林黛玉（蒋梦婕 饰）两小无猜，互有所属，然几番试探，倒惹得误会连连。繁花烂漫、歌舞升平的大观园，锁不住那心底的寂寞，护不住那嫩蕊芳沁，儿女情长何处寻，生离死别自悲吟，一任如花美眷为暴风雨摧残凋零，好一似食尽鸟投林，落得白茫茫大地真干净……Test Class:"We witnessed with our own eyes that these devices were destroyed one by one in front of the attack. The lesson learned is very simple: we can really ease the DDoS crisis only if attacks are curbed before they actually reach these devices. Security devices also have vulnerabilities, as many as the servers we want to protect," Sockrider explained. In order to achieve a better defense effect, we must rely on the support of upstream network operators or hosted security service providers, whose assistance can block attacks from the network system.2080年，世界能源问题已因中国科学家马博士运用太阳能而解决，但这亦引起部份能源商重大损失，恨马博士入骨，不断派遣杀手要除去此眼中钉！唐顺之轻笑摇头，按照文长的意思，我已在南京教授了杨长帆整整一个月，汝贞也请了我一个月。讲述了充满梦想和清纯的女大学生，在被两个男人伤害及糟蹋后，为报复变身为美艳动人的复仇女的故事。这是一部讲述罪恶与良知以及责任感的成长影片。28岁的主角，因10年前，在高中时期被近迫参与了一件性暴力案的罪恶感而感到痛苦，并一直忏悔着。他在走向崩溃的边缘，将会做出怎样的选择，令人震惊和麻木。