Korean · Pronunciation Guide
dool, but with a first consonant sitting between English d and t, and a bright forward l at the end.
dul
One syllable. Since 둘 is a native numeral, note the shape change it undergoes before counters, where it becomes 두 and loses the ㄹ entirely -- so the l you practise here vanishes the moment you count objects with it.
Listen: 둘
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저는 동생이 둘 있어요.
Jeoneun dongsaengi dul isseoyo.
I have two younger siblings.
Listen: 저는 동생이 둘 있어요.
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저는 동생이 둘 있어요 places 둘 immediately before 있어요, and in connected speech the final ㄹ links smoothly into the vowel-initial syllable that follows, giving something like du-ri-sseo-yo. That linking works on exactly the same principle as English 'far away' becoming 'fa-raway'.
English speakers voice the ㄷ fully, producing a buzzy 'dool' that a Korean ear registers as off -- and if they overcorrect with a puff of air they land on 툴 with an aspirated ㅌ instead. The plain consonant is neither: no buzz, no breath. The final l should also stay light and forward rather than becoming the swallowed dark l of English 'tool'.