spirant
n. 摩擦音
1. a continuant consonant produced by breath moving against a narrowing of the vocal tract
1. of speech sounds produced by forcing air through a constricted passage (as `f', `s', `z', or `th' in both `thin' and `then')
The question of spirant and the development are, and then the improved method is discussed.
針對橡膠軸承存在的鳴音問題,介紹了改進研究的進展, 提出改進方法.