| 单词 | hardening | 
| 释义 | hardening [`hard·ǝn·iŋ]  BOTANY Treatment of plants designed to increase their resistance to extremes in temperature or drought.  METALLURGY 1. Imparting hardness to carbon steel by abrupt cooling (quenching) through a critical temperature range.  2. Heat-treating an age-hardening or precipitation-hardening alloy at intermediate temperatures. 3.  | 
	
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