• Over centuries, Manchurian ancestors lived in Northeast China of short frost-free season with fishing and hunting being their main economic sources instead of planting.

    满族先祖长期生活无霜期东北,初种植、多渔猎主要经济来源

    dict.cnki.net

  • A paper published in the Proceedings of the National Academy of Sciences reported that the ragweed pollen season in North America has been getting longer as the number of frost-free days increases.

    篇发表国家科学院行动计划里论文中花粉过敏症季节已经北美无霜期一样延长了。

    article.yeeyan.org

  • A paper published in the Proceedings of the National Academy of Sciences reported that the ragweed pollen season in North America has been getting longer as the number of frost-free days increases.

    篇发表国家科学院行动计划里论文中花粉过敏症季节已经北美无霜期一样延长了。

    article.yeeyan.org

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