n. 
合元音
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approver, approving, approvingly, approx, approximability, approximal, approximant, approximate, approximatedata, approximately,
相似单词
diphthongal, diphthongia, diphthongise, diphthongization, diphthongize, diphthongoid, diphthongoidal, diphycercal, diphycercy, Diphyl,