Mandarin:
表面光洁度

Explanation in English Language (EN):
The texture and quality of a material's surface after machining or treatment, affecting aesthetics and function.

Explanation in Mandarin (ZH):
材料在加工或处理后的表面质感和质量，影响其外观和功能。

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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.