[ying4 hua4] /to harden/hardening/sclerosis/fig. to become rigid or inflexible in opinions/to ossify/
  [ying4 hua4] /erhärten, festmachen (u.E.) (V)/
  [ying4 hua4] /durcir/
 [こうか] /(n,vs,adj-no) (ant: ) hardening/vulcanization/vulcanisation/sclerosis/curing/(P)/EntL1280520X/
Visszatérés a(z) „硬化” laphoz.