Chinese · Pronunciation Guide
dee-TYEH: a hard-falling first syllable with no puff of air, then a low sagging second with a strong puff. The aspiration contrast is the point.
dìtiě
Fall then dip, with no conversion — the rule needs two dipping tones in contact and dì falls. The word is really an aspiration drill in disguise: two alveolar stops in a row, one silent on release and one with a strong puff, and confusing them turns the syllables into each other.
Listen: 地铁
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我每天坐地铁上班。
Wǒ měi tiān zuò dìtiě shàngbān.
I take the subway to work every day.
Listen: 我每天坐地铁上班。
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我每天坐地铁上班。 opens with wǒ and měi adjacent, both dipping, so wǒ rises. Then tiān holds level, zuò plunges, dì plunges again, tiě dips, and shàngbān gives a fall and a level. Two consecutive falls in the middle need separate resets rather than merging into one slide.
The breath contrast collapses for most learners, so both syllables come out the same — either both breathy or both silent. Feel the air on your palm for tiě and not for dì. The vowel in tiě is the other issue: reduced to "tuh" it loses the "ee" glide and the open "eh" that carries the tone.