- length of frost free period
- length of frost free season
- 无霜期: frost-free season; frostless ...
- 间: space in between; opening
- 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
- 四个月无霜期: four-months frost-free period
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