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。

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It has the power to determine the fishing calendar, the volumes and dimensions of species that can be caught, and what fishing techniques are permitted to catch them.

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