Early Old Thai also apparently had velar fricatives as distinct phonemes.
早期的古泰国人显然也把软腭摩擦音作为独特的音素。
Studies of English fricatives and affricates have shown that their voicing is severely influenced by the voicing of the following sound.
对英语擦音和赛擦音的研究表明它们的浊音音质其实深受其后辅音清浊的影响。
This paper compares approximants with continuants, semivowels, fricatives, liquids, and vowels, and identifies the initial ri in Mandarin as an approximant rather than a voiced fricative.