Chinese · Pronunciation Guide
doong-TYEN, both syllables high and flat. An unaspirated d then a strongly aspirated t — the breath contrast is the technical content.
dōngtiān
The pitch never moves — two flat syllables and no movement anywhere. The word packs in two contrasts at once: aspiration between the two alveolar stops, and nasal position between the back-closing first syllable and the front-closing second. If either contrast collapses, the word becomes indistinct rather than merely accented.
Listen: 冬天
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冬天很冷。
Dōngtiān hěn lěng.
In winter it's very cold.
Listen: 冬天很冷。
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冬天很冷。 has hěn and lěng adjacent, both dipping, so hěn rises: dōngtiān hén lěng. The sentence therefore holds high for two beats, climbs slightly on the converted hén, and sinks to the floor on lěng. Producing two laboured dips instead is the standard beginner version.
That puff-versus-no-puff distinction is the specific thing to get right: dōng has no breath and tiān has plenty, and English speakers tend to aspirate both. Feel the air on your palm for the second and not the first. The -ong vowel also opens out to an English "ong", and the hěn lěng conversion is the usual casualty in the sentence.