Chinese · Pronunciation Guide
wahn, rising from mid to high. Lip-rounding to start, a wide open vowel, and a front n to finish.
wán
Stable in every environment. The relevant contrast is with 完 wán, "to finish", which is a true homophone — identical tone, identical sounds. Tone does not disambiguate here, and only context does, which is a useful corrective to the idea that tones solve everything.
Listen: 玩
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孩子在公园玩。
Háizi zài gōngyuán wán.
The child is playing in the park.
Listen: 孩子在公园玩。
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孩子在公园玩。 ends on wán, so the rise has nothing after it and can be fully realised — the sentence literally finishes by going up. Before that, hái climbs too, zi is toneless, zài falls, and gōngyuán gives a level high then another rise. Three rising tones in one short sentence, which makes the falling zài stand out sharply.
Trouble starts with the vowel: after a w-glide English pulls toward "won" or "wahn" with a back rounded quality. The lips round for the glide and then must relax for an open, unrounded "ah". The nasal drifts too — wáng with a back nasal is a very common syllable and a common surname, so the merger has real consequences.