Chinese · Pronunciation Guide
shweh, low and sagging — the thin x hiss plus the rounded front ü opening to "eh". No w-glide anywhere in it.
xuě
Whether it dips or rises depends on what follows, and 雪 shares its exact segments with 学 xué, which carries a rising tone instead. Snow and study differ only in pitch direction, and both appear in ordinary sentences, so the contrast is a practical one rather than a textbook curiosity.
Listen: 雪
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山上有雪。
Shān shàng yǒu xuě.
There's snow in the mountains.
Listen: 山上有雪。
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山上有雪。 puts yǒu and xuě side by side, both dipping, so yǒu rises: shān shàng yóu xuě. The sentence opens level, drops on shàng, climbs on the converted yóu, and sinks on xuě. Four syllables covering four different pitch states, with the conversion sitting right in the middle.
Two things go wrong together. The x becomes an English "sh", pulling it toward the retroflex series, and the ü becomes a plain w-glide, giving "shweh" in the English sense. Spread the lips for the hiss, then round them for the vowel while keeping the tongue forward. The yǒu xuě conversion is the third casualty.