北方民族在长期的渔猎生产中逐渐形成了以物候确定年岁、节的自然物候历，用以指导人们的生产与生活。
The ethnic groups in North China gradually invented a kind of phenology calendar that shows year and season by natural phenomena in the process of fishing and hunting to guide production and life.
北方民族在长期的渔猎生产中逐渐形成了以物候确定年岁、节的自然物候历，用以指导人们的生产与生活。
The ethnic groups in North China gradually invented a kind of phenology calendar that shows year and season by natural phenomena in the process of fishing and hunting to guide production and life.
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