fā yīn shí / qì liú / tōng guò / xiá zhǎi / de / kǒu qiāng tōng dào / xíng chéng / mó cā yīn

发音时，气流通过狭窄的口腔通道，形成摩擦音。

When a sound is articulated, air passes through a narrow passage in the mouth and produces a fricative.