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4. Large investment, The density is too high when the water supply is not available, Misgurnus anguillicaudatus invested about 500 kg, Monopterus albus invested about 100 kg, and snails invested about 3,000 kg. These items were basically not sold back at all. The workers hired two, 6,000 a month. The reason was that they were too optimistic about the prospect, the workers did not pay attention, and they basically had to worry about themselves. Therefore, the breeding should be done slowly by their own family as far as possible, and people should be hired when the scale went up.In reality, we often encounter multi-classification learning tasks. Some two-classification learning methods can be directly extended to multi-classification, but in more cases, we use two-classification learners to solve multi-classification problems based on some basic strategies. Therefore, the fundamental method of multi-classification problem is still the two-classification problem.发布会还邀请了一些知名明星、美女模特，声势浩大，非常热闹。可是主和的也有好几人。他坐在床上，摸摸胸腹边的细排骨，觉得有些硌手，叹了口气想，这时候骑小灰，它肯定就能驮得动自己了。Be cautious in the end and pursue the far.