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Shanxi ProvinceThis mode applies to scenarios: If we want to add new functions to an existing class, we have to consider several things: 1. Will the new functions have compatibility problems with the existing functions? 2. Will it need to be added later? 3. What if the class does not allow code modification? Facing these problems, the best solution is to use visitor mode, which is suitable for systems with relatively stable data structure, decoupling data structure and algorithm,摸到一颗凸起的后槽牙，轻轻地摁了下去——中间一排书架忽然往后退了一尺多地，两边露出狭窄的暗门来。8. The term "ship limited to draft" refers to a motor ship whose ability to deviate from its course is seriously limited due to the relationship between draft and the depth and breadth of navigable waters.Then let's talk about the method of distinction now.At the beginning, No one has linked these big wasps to the Vietnamese army. However, everyone knows that it is definitely not a good thing for this kind of thing to fly over. I also don't know who it is. I shouted a "fight" at the top of my voice. This loud cry is called a big one. I can actually hear it very clearly through the interference of the "buzzing" sound. Afterwards, I am still thinking, if there is no "buzzing" sound of these big wasps, how loud is this person's voice? I'm afraid the loudspeakers can't compare with them.