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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:Located in Shuikou Town, Dehua County, it is mainly composed of Daixian Waterfall, known as the "First Waterfall in East China", gentle oil spill sacrifice waterfall and the mountains and waters along the way. It is a rare eco-tourism scenic spot. Up the Chishi Creek, the natural wonders along the way, which are rippling, covered with thick shade, verdant trees, vines, deep and secluded, birds singing in the valley and peaks swinging back and forth, constitute a unique primitive ecological secluded environment. Oil leaks to waterfalls, and streams gurgle down cliffs more than 110 meters wide like knives, sparkling, spraying beads and splashing jade, just like silver blankets made of tens of millions of broken strings of pearls, which are lightly spread and inlaid on the cliffs. At Daixian Waterfall, the stream plummeted 139 meters down from the steep peak of the mountain. Clouds turned over and snow poured down. It was thunderous and spectacular. Standing under the waterfall, the smoke was steaming and confusing. If it is sunny, the rainbow in front of the waterfall is like an overpass flying in the air, which is very beautiful. At the top right of Daixian Waterfall is a Feixian Pavilion, which tells the beautiful story of fairies showing their saints and saving the people. Looking at the head by the railing, facing the abyss below, Dai Xian's double waterfalls set off on the left and right sides, with no momentum.(6) A ship engaged in towing operations which severely limits the ability of the tug and its towed objects to move away from its course.Japan's transportation system is relatively complicated. There are several kinds of ticketing machines in Nagoya subway system. Xiao Bian will explain them one by one.In order to pollinate by hook or by crook短暂的一天里，许多人的命运发生翻天覆地的改变……