Having freely articulated, highly mobile joints.
有自由连接,活动自如的关节的
articulated without friction and capable of being prolonged like a vowel.
流音的无摩擦清晰发出并可象元音一样延长的
A single vowel articulated without change in quality throughout the course of a syllable, as the vowel of English bed.
单元音在一个音节的发音过程中不改变音质的单元音,如英文单词bed中的元音