Hindi · Pronunciation Guide
Looks like English "teen," sounds different in both consonants: dental unaspirated t at the front, dental n at the back.
teen
Single heavy syllable, long vowel plus coda; nothing to negotiate rhythmically. The interest lies in the fact that both consonants are dental, so the tongue tip stays parked at the teeth for the whole word.
Listen: तीन
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अभी तीन बजे हैं।
Abhee teen baje haiṁ.
It's three o'clock.
Listen: अभी तीन बजे हैं।
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"Abhee teen baje haiṁ" uses baje, the oblique form used in telling time, and the verb agrees as plural haiṁ because the hours are counted. Note abhee's breathy-voiced bh at the start — an easy sound to flatten right before the numeral.
Because the roman spelling is identical to an English word, almost nobody adjusts anything. Say English "teen" and you produce an aspirated alveolar t, which lands between Hindi त and ट and carries a puff that belongs to थ. Park the tongue on the teeth, hold the breath, and the difference is immediately audible.