现代汉语普通话中的单元音o只存在于边际音之中,在与唇音声母拼合时的实际音值不是单元音韵母o[o],而是复合韵母uo[u(?)]。在近代汉语语音演变史上,圆唇元音[o]发生了系列音变。根据普通话的实际读音以及语音描述的准确性原则,目前通行的拼写为bo、po、mo、fo的音节,改写为buo、puo、muo、fuo可能更具合理性。 The unitary o in modern Chinese Mandarin is only present in the marginal vowels, and the actual vowel when combined with the lip-initials is not the unitary vowel o [o], but the compound vowel uo [u (?)]. In the history of modern Chinese phonetic evolution, a series of phonetic changes have taken place in the round vowel [o]. Based on the actual pronunciation of Putonghua and the accuracy of phonetic descriptions, it is probably more reasonable to rewrite the syllables currently spelled bo, po, mo, fo and rewritten as buo, puo, muo, fuo.