Chinese · Pronunciation Guide
shyen-shung: a high level first syllable with the thin x hiss, then a weak toneless second with a retroflex one. Two different hisses in one word.
xiānsheng
High and flat, then a syllable with no pitch at all, giving a strong-weak shape. The neutralisation of 生 is what distinguishes this title from 学生 xuésheng and 医生 yīshēng, where the same character behaves differently — toneless in one, fully level in the other. The reduction is lexical, not a general rule about the character.
Listen: 先生
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王先生是我的老师。
Wáng xiānsheng shì wǒ de lǎoshī.
Mr. Wang is my teacher.
Listen: 王先生是我的老师。
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王先生是我的老师。 gives Wáng rising, xiān level, sheng fading, shì falling, wǒ dipping, de fading, then lǎoshī with a dip and a level. Wǒ keeps its full descent because de is toneless. Two neutral syllables in the sentence are what give it a conversational rather than announced quality.
The two hisses get merged into a single English "sh", which erases the distinction the word is built on: x is thin and forward with spread lips, sh is dark and hollow with the tongue curled back. Say them as a pair. Restoring a full tone to sheng is the other error, and the -ian final routinely opens out to "shyahn".