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1. Oxford Dictionary

   age hardening

   • n.
     spontaneous hardening of a metal which occurs if it is quenched and then stored at ambient temperature or treated with mild heat.

   • noun: age hardening

2. • 相關詞

   induction hardening

   • n.
     a process for hardening steel surfaces by induction heating followed by quenching.

   Oxford Dictionary

   induction hardening

   • n.
     a process for hardening steel surfaces by induction heating followed by quenching.

   Oxford American Dictionary

   hardening of the arteries

   • n.
     the thickening and hardening of the walls of the arteries, occurring typically in old age.

   Oxford Dictionary

   hardening of the arteries

   • n.
     the thickening and hardening of the walls of the arteries, occurring typically in old age.

   Oxford American Dictionary

3. • 更多解釋

   age hardening

   • IPA[āj ˈhärdniNG]

   • n.
     spontaneous hardening of a metal which occurs if it is quenched and then stored at ambient ...

   Oxford American Dictionary