- four-months frost-free period
- 四: four
- 月: the moon
- 无霜期: frost-free season; frostless ...
- 无霜期: frost free period; frost free season; frost-free days (period); frost-free growing season; frostfree season; frost-freedays（period）; frost-proof date; frostless season; period of frost free
- 无霜期长度: duration of frostfree period; length frost-free season
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