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.
针对橡胶轴承存在的鸣音问题,介绍了改进研究的进展, 提出改进方法.