回火 (huí huǒ) — temper (metallurgy, heat treatment); backfire (engine/vehicle misfire)
Definition
In metallurgy, 回火 (huí huǒ) means to temper steel — reheating hardened metal to reduce brittleness. The same word also means an engine backfiring, an unrelated everyday sense.
verb
temper (metallurgy, heat treatment)backfire (engine/vehicle misfire)
Examples
- 回火。Zhè zhǒng gāng xū yào jīng guò huí huǒ chǔ lǐ cái néng biàn yìng.This type of steel needs to undergo tempering to become hard.
- 回火，。Qì chē fā dòng jī tū rán huí huǒ le, xià le wǒ yí tiào.The car engine suddenly backfired and startled me.
- ，。Shī fu huí le yí cì huǒ, gōng jiàn jiù hé gé le.The master tempered it once, and the workpiece was qualified.
Browse more HSK 7-9 words or search the full 43,000-word dictionary.