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The main purpose is to save a state of an object, In order to restore the object at an appropriate time, I think it is more vivid to call the backup mode. Generally speaking, assuming that there are various attributes in the original class A and A, A can decide the attributes to be backed up, memo class B is used to store some internal states of A, and class C is used to store memos and can only store, not modify and other operations. Make a picture to analyze it:该剧讲述了二十世纪二十至四十年代，一个好吃好玩的怂人贝勒哈岚，阴差阳错得到一部记载皇陵宝藏的的密疏，从此命运突变的故事。该剧以北京为背景，融入了京剧、美食、黑帮、冒险、家庭伦理等吸睛元素，将时代更迭中小人物的牺牲与挣扎，绘成了一幅苍凉悲壮的传奇画卷。你看着不是，怀王册封他为绍兴侯，食邑山阴七万户。, lobster habits. Lobster belongs to insect shell animals, similar to crabs, with a pair of specially developed chelates and the habit of digging caves. Generally, lobsters dig caves near the water's edge. Lobsters like shade and fear light. When the light is weak or dark, they climb out of the cave. When the light is strong, they sink to the bottom or hide in the cave. Lobsters have spawning periods twice a year in spring and autumn. A pair of male and female lobsters can breed up to 480 shrimp seedlings at a time. Usually, the lobsters listed in early spring are the shrimp larvae bred in the autumn of last year, while the shrimp larvae bred in spring only need to be bred for more than 60 days to be listed. Lobster farmers only need to keep the large whole lobster for planting in the first year. In autumn, the lobster will go into the cave to give birth. In the second year, they do not need to buy too many lobster seedlings. 2. Big appetite and miscellaneous eating habits. Lobster has a very good appetite and can be fed with animal and plant feed, such as miscellaneous fish, miscellaneous meat, wheat, corn and other wild omnivores. 3, not afraid of dirty and smelly water, afraid of chemicals. Lobster is not afraid of dirty and smelly water, but it is very sensitive to chemicals such as pesticides, fertilizers and liquefied petroleum gas. As long as there are these chemicals in the pond, the lobster will be destroyed. Second, lobster breeding technology 1, to create a good lobster growth environment. Lobsters like to make holes. Generally, the depth of caves is 50-80cm, and the depth of some caves is more than 1m. In order to avoid escaping from the holes, the width of the ridges around the aquaculture water body should be more than 1.5 m, and 0.5 m high anti-escape nets or smooth anti-escape walls and anti-escape boards should be set up around the ridges. The anti-escape boards and fences should also be buried 2m deep to prevent lobsters from escaping. At the same time, the river pond simulates the ecological environment of lobster under natural conditions.由《孤独的美食家》的工作人员制作的新系列登场！不卖座的漫画家？妄想家30岁左右的男子，乌山纯平（户冢纯贵）误入日本各地的纯咖啡馆。在那里发生的各种各样的电视剧是？无论是谁都会以主人公的视角爱上纯咖啡的电视剧指南节目《恋上纯咖啡》2021年4月开播续篇！续集第一集是东京？三河岛的纯咖啡“维也纳”！