hardenv.(使)变硬；(使)坚强hardening liquid硬化液,淬火液harden and grind硬化与研磨Harden treatment硬化剂hardened horizon硬层harden sb to sth使(某人)无动于衷； 习以为常hardening action硬化作用hardened circuit硬化电路harden by itself自身硬化hardening strain硬化胁变harden right out使完全硬化