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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:　系列短剧以不同时期的40组人物和闪光故事，记录中国共产党诞生一百年以来团结和引领中国人民，高擎理想和信仰的炬火，谋求民族独立、人民解放、国家富强，为实现中华民族复兴中国梦不息奋斗的动人征程。小女儿的jiāo羞神态可想而知，二人虽只是在一起短暂的几天，可毕竟是挂名的夫妻，少不得许多场合在在一起。　　究竟他们曾如何活过、又是如何死去的呢？In recent years, due to the strong development trend of online education and quality education, the education field that combines the two has attracted many entrepreneurs and is favored by many capital. Among them, it is considered to be another emerging track in the field of online education after children's English-the cultivation of children's thinking ability, which has become the target of capital investment. From February 2017 to now, more than 10 financing incidents have been revealed in the related fields of online children's thinking ability training, and the frequency is increasing.6傻子才看不出他牵挂小葱。