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Apple TV+原创剧集《看见》正式续订第二季。C) Metaphors of everyday life. Use some real-life examples to illustrate the so-and-so pattern, which can enable you to quickly grasp the purpose of a certain pattern and the structure of the implementation code. At the same time, you should realize that this metaphor is like telling you (2 +3) 2=22+2*2*3+32. You need to draw an analogy and come to (a + b) 2=a2+2ab+b2. The concrete application of the model in practical work is equivalent to the application of algebraic formulas.Action:The meaning of cache agent is to cache the first run time, and when running the same again, it will be taken directly from the cache. The advantage of this is to avoid repeating the operation function once. If the operation is very complicated and consumes the performance, then using cache objects can improve the performance. We can first understand a simple cache column, which is the common addition and multiplication operations on the Internet. The code is as follows: