Mandarin:
体积庞大的侧基

Explanation in English Language (EN):
Large chemical groups attached to polymer chains that hinder chain packing and crystallization, affecting material flexibility and thermal behavior.

Explanation in Mandarin (ZH):
附着在聚合物链上的大尺寸化学基团，阻碍链的排列和结晶，从而影响材料的柔韧性和热性能。

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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.