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This 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,SP讲述有一天，一具大约70、80岁的老人遗体被运送到兴云大学法医学教室，没有遗物与牙齿、指绞没建档无法判定身份，让朝颜（上野树里）想起某个事件。特别篇也会交代朝颜与丈夫・桑原（风间俊介）的相遇相识的过程。Lin Shucheng, vice-chairman of the Sichuan Provincial Committee of the Chinese People's Political Consultative Conference and secretary of the Liangshan State Committee, said that "Charming China City" has greatly enhanced our national cultural confidence and promoted tourism development. Last year, the growth rate reached 19.7%, and in the first quarter of this year, the growth rate reached 47%, showing a spurt of development.二十万长城边军，大秦最精锐的部队，全军覆没。9. Don't imagine that you are always doing short-term work and going in and out every day. This will make your transaction cost very high and lose a lot of money. The only benefit is the securities company. Moreover, you will not have such a high standard and you are not a banker.群龙无首，六神无主的赵国士兵这才彻底乱了，彻底地一败涂地。想了一会，便让刘黑子派人去集上接小葱回来住一晚。