回火的英文：
(n) backfire
tempering 回火（钢铁专业词汇）

参考例句：
  • degree of hardness and elasticity of a tempered meta
    （金属回火后的）硬度和弹性.
  • Backfire:an explosion of prematurely ignited fuel or of unburned exhaust gases in an internal-combustion engine.
    回火:过早点燃的燃料的爆炸或内燃机中未燃的废气的爆炸。
  • fire-proof baffle
    回火挡板
  • hardened and tempered
    淬火与回火的
  • Steel is tempered by heating and then cooling it
    钢是经过加热，然后冷却来回火。
  • Two times temper has little effect on the hardness.
    二次回火后硬度变化不大。
  • three times temper will decrease the hardness.
    三次回火后，硬度反而降低。
  • "Three. They are hardening, temper and anneal. "
    三种。它们是淬火、回火和退火。
  • Degree of hardness and elasticity of a tempered metal
    (金属回火后的)硬度和弹性.
backfire是什么意思：
v. 适得其反，事与愿违；放出逆火，发生回火
n. 逆火，回火
  • The car backfired.
    车回火了。
  • The engine backfired noisily.
    那发动机发生逆火引起爆鸣。
  • To explode in the manner of or make the sound of a backfire.
    用逆火的方式爆裂或发出逆火的声音。
  • The President's tactics could backfire.
    总统的策略可能会适得其反。
  • To start or use a backfire in extinguishing or controlling a forest fire.
    在熄灭或控制森林大火蔓延中燃起或使用逆火。
tempering是什么意思：
n. 性情；脾气；心情；回火
v. 使缓和；调和；（使）回火
  • hardened and tempered
    淬火与回火的
  • I was in a flaming temper.
    我正怒气冲天。
  • She is a girl of sweet temper.
    她是个性情温柔的姑娘。
  • He curbed his temper.
    他稳住了情绪。
  • Temperance is the best physic
    克制乃是最好的治疗

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