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故事发生在未来，当时人们的科技已经非常发达，可以再宇宙中自由航行，女高中生加藤茉莉香，本来过着非常普通的生活，一边打着短工，一边在快艇部参加学习活动。但是一天平静的生活被两位自称是她已去世父亲的部下，邀请她担任海贼船的船长。于是全新的宇宙之旅开始了。秦瀚忙点头道：就是这样。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 EncyclopediaA3.1. Pulse and blood pressure tests.There is a need for a skill competition in June, but so far there has been no news. The cashier has been paying great attention to strengthening his business knowledge and counting skills since receiving the notice of the skill competition, but he always does not know when to start the competition, and his original enthusiasm has been eroded.红椒道：只管说。刘邦轻叹一声，不管怎么说巴蜀现在还握在自己手中，那就不能让他这么轻易地丢出去。