满族先祖长期生活在无霜期短的东北，初以少种植、多渔猎为主要经济来源。
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.
初霜、终霜对气候变化的综合响应表现在无霜期的延长变化趋势存在明显的区域性差异。
The comprehensive response of first frost and latest frost to climate change showed that the extened variation trends have obvious regional differences.
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