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Explain that in the OrderPizza method, we do a lot of things, including calling the CreatePizza method to generate a desired pizza, and then doing a series of operations on the pizza. The key point is that Pizza is defined as an abstract class, which means that in the OrderPizza method we don't care what type this Pizza is at runtime, in other words, this is decoupling. The coupling between PizzaStore and Pizza is uncoupled.2268郑氏晓得这个二舅母眼皮子浅，这是眼红了，可她平常也没少贴补二舅家，因而也不吭声。In the case of a reflection attack, An attacker uses a controlled host to send a large number of packets, The special feature of these packets is that the destination IP address points to the server, router and other devices as the reflector, while the source IP address is forged as the IP address of the target. When the reflector receives the packet, it will think that the packet is a request sent by the attacked bird, so it will send the corresponding data to the target.陈平的笑容总是那般如沐春风。地球核心因为不明原因停止转动，导致存在于地球上的电磁场急速崩解，全球各地都出现异常灾难。美国波士顿在十个街口的范围内，有三十二名装置心律调整器的市民在一瞬间心脏停止跳动因而暴毙；西岸旧金山的地标金门大桥也突然断成两截，数百人坠入大海；而更离奇的是，聚集在伦敦特拉法加广场的成群鸽子突然之间失去辨识方向能力，于是成千上百只鸽子就这样冲进人群或是撞上玻璃窗，不但伤及无数游客，更让车辆驾驶失去控制发生严重意外。说好了只要王兄有的，都可以用来做彩头