The dairy farming in Hokkaido has beeing developed rapidly since 50's in twertieth century, the scale of daing farm has beeing extended constantly while the family number of dairy farmer is decreased.
摘要北海道奶牛业从20世纪50年代开始快速发展，奶农户数减少的同时
模不断扩
。
The dairy farming in Hokkaido has beeing developed rapidly since 50's in twertieth century, the scale of daing farm has beeing extended constantly while the family number of dairy farmer is decreased.
摘要北海道奶牛业从20世纪50年代开始快速发展，奶农户数减少的同时模不断扩。
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