Chinese · Pronunciation Guide
hwahn, dropping hard from high to low. A scraped h, immediate lip-rounding, then a wide open vowel and a front n.
huàn
Fixed itself, disruptive to its left: 不换 becomes bú huàn. It contrasts with 还 hái and 环 huán, both rising, so the falling contour is doing genuine identification work in a crowded phonetic neighbourhood.
Listen: 换
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我想换工作。
Wǒ xiǎng huàn gōngzuò.
I want to change jobs.
Listen: 我想换工作。
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我想换工作。 opens with the wǒ xiǎng sandhi — two adjacent third tones, so wǒ rises. Then huàn drops sharply, gōng holds high, and zuò falls again. The sentence therefore climbs, plunges, jumps back to the top and plunges again, which is a lot of vertical movement for five syllables and quite typical of Mandarin.
The h vanishes for many learners, leaving "wahn" — because English "h" before a rounded glide is weak and easily lost. Add real friction at the back of the mouth. The nasal is the second issue: huàng with a back nasal is a different syllable, and the drift is invisible to an English ear unless you deliberately check where your tongue tip finishes.