记忆方法
1. phon- => phthong- "sound, voice" => diphthong.
中文词源
diphthong 二合元音
来自希腊语diphthongos, di-, 二，-phthongos, 声音，词源不详，可能同phone. 用来指二合元音。
英语词源
- diphthong (n.)
- late 15c., from Middle French diphthongue, from Late Latin diphthongus, from Greek diphthongos "having two sounds," from di- "double" (see di- (1)) + phthongos "sound, voice," related to phthengesthai "utter, speak loudly."
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