Ministry of Education 《Revised Mandarin Chinese Dictionary》

Word
Bopomofo ㄩㄢˊ ㄩㄢˊ ㄅㄨˋ ㄉㄨㄢˋ
Hanyu pinyin yuán yuán bù duàn
Synonym 綿綿不斷
Interpretation
形容連續而不間斷。如:「井一鑿開,水便源源不斷的往上冒。」

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