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(2) Be able to skillfully use tools such as program operation flow and debugging;The above design, as commented above, when executing the Resize method of SmartTest, if a rectangular object is passed in, when the height is greater than the width, the width will be automatically increased until it exceeds the height. However, if a square object is passed in, it will fall into a dead loop. The fundamental reason at this time is that rectangles cannot be the parent class of squares. Since there is a problem, they can be reconstructed so that both of them inherit from quadrilateral classes. The refactoring code looks like this:Defines the skeleton of the algorithm in an operation while delaying some steps to subclasses. TemplateMethod allows subclasses to redefine certain steps of an algorithm without changing the structure of the algorithm.陈平续道：唉，鸿门军营危险重重，沛公深感安全得不到保障，无奈之下不告而别，先行赶回霸上也在情理之中啊。罗曼回到了那块邻近乌克兰边境的土地---这块地是他刚从祖父那里继承来的。他决定卖掉这个寸草不生的地产，但被一帮当地黑社会的人所警告，因为他的祖父曾是这帮人的首领。他们绝不会就此放弃这片土地---以及他们的走私产业---更不会束手就擒。比尔·普尔曼继续饰演警探Harry Ambrose，他回到了纽约郊区的家乡，对一桩令人不安的、令人痛心的犯罪事件进行调查——一个11岁男孩杀死了他的父母，没有明显的动机。Ambrose意识到这个男孩并不寻常，来历也很可疑，他被卷入了家乡的黑暗面中，与那些不惜一切保护秘密的人对抗，一个神秘的女儿被证实是这个复杂拼图的一部分。库恩饰演Vera，一个难以对付、神秘的女人，她在维护社会理想和满足自己的欲望之间挣扎。　　《Visible: Out on Television》定于2020年2月14日在Apple TV +上首播。