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1. Oxford Dictionary

   harden off

   • ph.
     acclimatize a plant to cold conditions by gradually increasing its exposure
2. • 相關詞

   harden something off

   • ph.
     inure a plant to cold by gradually increasing its exposure to it

   Oxford Dictionary

   harden something off

   • ph.
     inure a plant to cold by gradually increasing its exposure to it

   Oxford American Dictionary

3. • 更多解釋

   harden off

   • ph.
     acclimatize a plant to cold conditions by gradually increasing its exposure

   Oxford American Dictionary