AbstractCalculator is an auxiliary class that provides auxiliary methods. Next, implement each of the following classes in turn:
Until his father died, Li Lei did not have a chance to talk with his father about his regrets in his life, his unfulfilled wishes and his funeral. Li Lei is not very good at expressing his heart. He should think twice before speaking. He and his father also seldom communicate, and they will not and do not understand how to cut into deeper topics at once.
不孝的男人谁会嫁？提笔毫不犹豫地写下先救娘三个字，写完那香还才烧一点呢。
Although she often suggests others to sign the marital property agreement, she did not sign it herself.
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就在庄谢沉浸在那个波澜壮阔、波云诡谲的武侠世界时，手机突然响了。
探长Peter Boyd指挥着一支经过多种训练的警探和科学家的警察队伍—悬案小组，使用现代的方法和原来调查时还没有的新科技来专门调查未破获的老谋杀案。
Boxing
战事似乎是一促即发，龙且对此心里一直有些忐忑。
一边起身让开，春妮端了木盆上前，白猫搬过一张木凳放在珊瑚面前，又用大幅棉巾将她胸前围住，才低头帮她净面。
How to practice speaking? Orange dreamed of giving a P10 speech at Touma International Speech Club at the end of last year and summed up her one-year deliberate practice of public speech. She shared her speech with Mr. Guan, hoping that her personal experience would give him some inspiration.
十票加一更，为三更努力吧。
在《速度与激情1》中，为了逃避警察的追捕，多米尼克（范·迪塞尔 Vin Diesel 饰）离开洛杉矶一直流亡于多米尼加共和国。而一车价值140万美金的石油装载车让蛰伏多年的多米尼克再次驾车驰骋起来。而这时，却传来红颜知己莉迪（米歇尔·罗德里格兹 Michelle Rodriguez 饰）惨死的消息。为了查明真相，满腔怒火的多米尼克再次孤身赶回美国。原来，莉迪是为了获得赦免多米尼克的机会，而协助警局抓捕大毒枭坎波斯（约翰·奥提兹 John Ortiz 饰）。不过出于习惯，坎波斯将运送毒品后的莉迪杀人灭口。这样，一边是为女友报仇的多米尼克，一边是历练多年的警探布莱恩（保罗·沃克 Paul Walker 饰），两人再次携手，目标直指大毒枭巴尔加。一场急速复仇就此展开……
Only amateur athletes are allowed to participate in the Olympic boxing matches, which are divided into 12 categories according to their weight: 48, 51, 54, 57, 60, 63.5, 67, 71, 81 and 91 kg or more.
一千个读者，就能读出一千种巫，而他对巫的理解就是这个。
她想道，他这辈子都别想丢开手了。
遥远的黑暗世纪，柯文诺斯的子孙一分为二。血族在维多（比利·奈伊 Bill Nighy 饰）的领导下独行天下，强大的吸血兵团压制极具传染性且无法进化成人的残暴狼族。直到某天，一个神奇的生命诞生，改变了这两个家族的命运。一只母狼诞下有着人类外表的狼人路西安（麦克·辛 Michael Sheen 饰），维多窥见狼人身体内的强大实力，于是对其大量繁殖，并将狼人纳为服务血族的奴隶。奴隶的苦难永无终结，而在这一过程中路西安还冒天下之大不韪与维多的女儿桑雅（罗娜·迈特拉 Rhona Mitra 饰）偷偷相恋。
