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不知怎样跟孙女解释这其中的关窍。第二部（台湾版）：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.CNCERT found that in February 2018, more than 1500 targets in China suffered DDoS reflection attacks, of which 14.3% suffered memcached reflection attacks. 34.7% of the target victims suffered NTP reflection attacks. 51.0% of the targets suffered from SSDP reflection attacks. The distribution of these targets by province is shown in Figure 12, with Zhejiang Province accounting for the largest proportion, accounting for 21.3%. This was followed by Jiangsu, Guangdong and Fujian provinces.16.7 Olfactory loss is unqualified.Defines a one-to-many dependency relationship between objects. When the state of an object changes, all objects that depend on it are notified and automatically updated.