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Some plants are very picky when choosing pollinators. The flowers of European Trollius are like a real safe deposit box, and only six kinds of insects know the code to open the safe deposit box. These lucky people all come from the genus Brevicorn. Only they know how to get into the sepals of European Trollius and find the center of the flower. However, no matter how hard other insects try, they can only fail with disappointment. The short-horned flower fly, which has gone to great pains to pollinate European Trollius, will naturally receive considerable "remuneration". Female short-horned flower flies lay eggs on the carpels of flowers. When the larvae are hatched, they will eat the seeds of flowers and grow up. This symbiotic relationship also has certain risks for European Trollius. The more short-horned flower flies, the greater the chance of pollination, but at the same time, the more insects parasitic on flowers. The cooperative relationship between the two was formed millions of years ago and continues to this day. It is a model of relative balance and harmonious symbiosis in nature.The easiest thing to distinguish should be the six patterns in the high wind transmission. After all, there are six patterns of seeking Tao jade and unique lines.他似乎走进书中，看着洪荒世界从开始到结束，看着无敌的圣人永世寂寞，看着芸芸众生悲欢离合，在一个个量劫中，周而复始的循环沉沦………………《佛本是道》完结了，虽然这个结局早有预示，但很多人还是接受不了。　　请命随军同行，顷刻之间，杭州精兵能将抽掉了大半。该剧改编自泰国作者Ms. Pitchaya Turdkwanchai文学作品《Samee Ngern phon》（译文：这个平凡的男子），讲述年近三十却从未有固定男友的霸道女总裁鹿方宁（周雨彤 饰）信奉“有钱和挣钱即王道”，一心想在公司内发展新家居品牌的她，却被要求必须先结婚生子才能获得机会，高智有颜的温柔男医生凌睿（龚俊 饰）成为她的目标，鹿方宁使尽性感招数想要撩动凌睿就范，本以为凌睿不为所动是冷情冷感，不料凌医生早在伺机反撩……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: