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Someone asked a question in Zhihu: Is the gun in the TV series real?6. The output is generally 300 kg, which is as high as 500-600 kg. The output in the second year will be slightly higher. Because of the original shrimp breeding, a pair of parent shrimps can breed hundreds of shrimps a year. In the second year, there is generally no need to replenish seedlings. If the first year is overworked, it is recommended to replenish part in March-April of the second year.Automatic Single Focus (AF-S): It is more suitable for shooting static objects or scenes with small motion amplitude.Visitor pattern decouples the data structure from the operations acting on the structure, making the operation set relatively free to evolve. Visitor pattern is suitable for systems with relatively stable data structure and easy change of algorithm. Because visitor mode makes it easy to increase algorithm operation. If system data structure objects are easy to change and new data objects are often added, visitor mode is not suitable. The advantage of visitor mode is that it is easy to add operations, because adding operations means adding new visitors. Visitor mode centralizes the relevant behaviors into one visitor object, and its changes do not affect the system data structure. Its disadvantage is that it is difficult to add new data structures. -From Encyclopedia徐文长低声道，我倒看他不是有意诬你。　　影片改编自詹姆斯·达什纳撰写的同名反乌托邦科幻小说三部曲的第二部。Create a new "Source" class under Packge "pojo":