hardening
  硬化;□煉;淬火;硬化劑
  hard·en·ing /ˈhɑrdnɪŋ, ṇɪŋ/ 名詞
  硬化
  Hard·en·ing, n.
  1. Making hard or harder.
  2. That which hardens, as a material used for converting the surface of iron into steel.
  ◄ ►
  Hard·en v. t. [imp. & p. p. Hardened p. pr. & vb. n. Hardening ]
  1. To make hard or harder; to make firm or compact; to indurate; as, to harden clay or iron.
  2. To accustom by labor or suffering to endure with constancy; to strengthen; to stiffen; to inure; also, to confirm in wickedness or shame; to make unimpressionable. “Harden not your heart.”
     I would harden myself in sorrow.   --Job vi. 10.
  hardening
       n 1: abnormal hardening or thickening of tissue
       2: the process of becoming hard or solid by cooling or drying
          or crystallization; "the hardening of concrete"; "he
          tested the set of the glue" [syn: solidifying, solidification,
           set, curing]
       3: the act of making something harder (firmer or tighter or
          more compact)