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[Subject: Generalities]
- Gwneud twll yn wyneb y ddaear
Translated by: GUEST USER
Translated in 35 languages
- Gwneud twll drwy ddrilio
Translated by: RHISIART HINCKS
Translated in 21 languages
[Subject: Applied Mechanics]
Translated by: KEVIN FLYNN
Translated in 13 languages
- Gwneud twll drwy ddefnyddio pigyn blaenllym
Translated in 10 languages
[Subject: Motoring]
- Gwneud twll mewn teiar
Translated in 3 languages