Chinese · Pronunciation Guide
shyah-TYEN: a hard-falling first syllable with the thin x hiss, then a high level second with a strong puff of air.
xiàtiān
A plunge then a plateau, with no sandhi. The two syllables offer a clean vowel contrast: xià has the wide open "ah" of the -ia final while tiān has the tight "eh" of -ian, despite both being spelled with an a. Hearing that difference is the whole point of learning the -ian final properly.
Listen: 夏天
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夏天很热。
Xiàtiān hěn rè.
Summer is hot.
Listen: 夏天很热。
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夏天很热。 keeps hěn at a full dip before the falling rè, so no conversion occurs. The sentence therefore runs fall, level, dip, fall — a drop, a plateau, a trough, and a final plunge. That leap from the floor of hěn back to the top of rè is the largest interval and the one most often flattened.
The x becomes an English "sh", which pulls xià toward the retroflex shà. Spread the lips and keep the tip down. Under-aspirating the t gives diān. And the two a spellings get pronounced alike, so tiān comes out as "tyahn" — the first syllable's vowel is open, the second's is tight, and they should not match.