How to pronounce 天文數字 in Cantonese (4 out of 5):

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但係6240呢個天文數字
But 6240 is the astronomical number.

Cantonese Sentence Breakdown

但係 daan6 hai6
(conjunction) but
呢個 ni1 go3
this
天文數字 tin1 man4 sou3 zi6
astronomical number
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