Quantum theory
量子理论
Explanation (EN)
Planck's theory that radiant energy is emitted or absorbed only in discrete units (quanta).
Explanation (ZH)
普朗克提出的理论:辐射能只能以离散单元(量子)的形式发射或吸收。
About the IPA
The International Phonetic Alphabet is a standardized system of symbols used to represent the sounds of spoken language.
It helps linguists, language learners, and educators accurately describe pronunciation across languages.
Example: the word "hello" in British English is transcribed as /həˈləʊ/ in IPA.