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"Is-A" refers to the "one" of one class and belongs to another class, while "Has-A" is different, which indicates that a certain role has a certain responsibility. A common reason for the wrong use of inheritance instead of aggregation is to mistakenly treat "Has-A" as "Is-A". For example:“渡江战役”是中国人民解放军实施战略追击的第一个战役，也是中国人民解放军根据党中央、毛主席“打过长江去，解放全中国”的伟大战略部署，向国民党残余发动最后全面进军作战的伟大起点。一群侦察战士，冒着生命危险渡江侦察，为了获得宝贵的情报和敌人展开了紧张激烈的周旋。他们面对的是敌人设下的重重陷阱与严密的围追堵截。侦察战士们以大无畏的革命精神，以及自身的智慧和勇气，像一把尖刀，深深插入敌人的心脏，在敌后游击队和人民群众的支持帮助下，在战火硝烟的洗礼中出色的完成了侦察任务，为我军顺利实施战役战术展开创造了有利的条件，为我解放大军顺利渡江，最终取得整个“渡江战役”的胜利奠定了坚实的基础。Fifth, the current curriculum system for online thinking ability training products is slightly thin, and the curriculum content needs to be continuously polished and improved.翻拍自《狐狸的夏天》Then it was about half an hour or so, Some sharp-eyed comrades found that the place less than 20 meters away from the position began to bulge with "earth beams", and these "earth beams" were still moving forward at a speed visible to the naked eye. Obviously, I remember the instructor who first found the big mice with binoculars. He shouted to the people around him, "Here are the mice. They want to get up and fight quickly!" , and then all of us are free to open fire, All kinds of weapons are aimed at those 'earth beams' vicious fight, The "earth beams" were hit by bullets and the earth was scattered everywhere. From time to time, bright red liquid can be seen seeping out, I know it was a hit, It must have been their blood, And there is indeed that kind of big mouse in it, Powerful weapons such as rocket launchers and recoilless guns can blow up a big pit in one shot. From the pit, you can also see many bodies of mice that have been blown to pieces. Some of them have been hit red-handed. Not only have their bodies been blown to pieces, but the fragments of the blown bodies are also everywhere. The scene is bloody than repulsing the Vietnamese army's strong attack.清圣祖康熙（许还山饰）晚年，四阿哥胤祯父凭子贵得承大统，极受康熙宠爱的孙子弘历也同时被立为太子，清宫内围绕着三代帝王的千古悬案终于拉开帏幕……雍正（刘冠雄饰）法治严苛，其暗杀组织“血滴子”更闻名天下，一时之间冤狱遍布，哀鸿遍野。少年弘历（吴京饰）奉旨微服巡抚江南，因缘际会结识了两名神秘少女，从而展开一段孽缘……弘历江南之行险阻重重，历经生死劫难之际，蓦然发现自己的身世背后竟隐藏着一个重大的秘密；而意中人鱼娘及其师姐吕四娘（范冰冰饰）要刺杀的仇人竟是当今皇上……9. Don't imagine that you are always doing short-term work and going in and out every day. This will make your transaction cost very high and lose a lot of money. The only benefit is the securities company. Moreover, you will not have such a high standard and you are not a banker.