Mandarin:
淬火

Explanation in English Language (EN):
A rapid cooling process used in heat treatment to harden metals, typically using water, oil, or air.

Explanation in Mandarin (ZH):
用于金属热处理的快速冷却过程，常使用水、油或空气来提高硬度。

International Phonetic Alphabet (IPA):
/kwˈɛntʃɪŋ/

Audio:

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International Phonetic Alphabet (IPA)
- Definition: A standardized system of symbols used to represent the sounds of spoken language.
- Purpose: Helps linguists, language learners, and educators accurately describe pronunciation across languages.
- Example: The word “hello” in British English is transcribed as /həˈləʊ/ in IPA.