hardening off meaning in English

幼苗健化

Potted plants should be hardened off before planting out
盆栽植物应经耐寒锻炼才能移植到室外。
These are the seedlings that are hardening off in a hotbed
这些是放在温床中经受耐寒锻炼的幼苗。
What is the best way to harden off new rose bushes only nine inches high
玫瑰花丛只有9英寸高的时候，怎样才能最有效地把它们培养到能在户外耐寒？
When the onion plants have hardened off , we can plant them in the garden ; they should be ready soon
洋葱长得够壮实时，我们就可以把它移栽到菜园里，现在该要快壮实了。
If the woodland was used for coppicing , as in hazel for fencing etc , the pigs would be kept away from the coppiced area for a year or two until the new growth had hardened off and developed a bark , to prevent it being eaten with everything else
如果森林里的植物是一些伏地植物，猪应该是远离这些地方一到两年直到这些植物变得坚硬，长的很高大，以防猪把这些还没有长成的植物给吃掉。