Definition
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Tri ar ddeg
Mae 'Tri ar ddeg' yn cyfeirio at y nifer 13 yn y Gymraeg.
The phrase 'Tri ar ddeg' refers to the number 13 in Welsh.
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Mae gen i dri ar ddeg o lyfrau ar y silff.
I have thirteen books on the shelf.
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Cafodd y plant tri ar ddeg o siocled i'w bwyta.
The children received thirteen chocolates to eat.
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Mae tri ar ddeg yn oedran da i ddechrau dysgu cerddoriaeth.
Thirteen is a good age to start learning music.