Korean · Pronunciation Guide
ta-da. The first consonant is aspirated with a real burst of air, the second is a plain soft d -- the same place of articulation, opposite behaviour.
tada
Both blocks the same length. The word doubles as a neat minimal drill for the aspirated-against-plain contrast, since both consonants are alveolar stops inside one short word and the only thing separating them is breath.
Listen: 타다
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지하철을 타요.
Jihacheoreul tayo.
I take the subway.
Listen: 지하철을 타요.
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지하철을 타요 uses the contracted 타요 and hands you a resyllabification in front of it: 지하철을 becomes ji-ha-cheo-reul as the ㄹ moves into the particle. The ㅎ inside 지하철 also lenites between vowels, so the noun runs smoother than its spelling suggests.
The two consonants get levelled: learners either aspirate both, giving 'ta-tha', or neither, giving 'da-da'. Korean keeps them distinct even at speed. Watch the vowels too, since both are the wide open ㅏ, and letting the second reduce to a schwa imposes an English rhythm on the word.