Welsh News — September 22, 2017 at 8:37 am — Updated: September 22, 2017 at 8:37 am

‘Angen gwneud mwy i ragweld llyncdyllau’ medd arbenigwr

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Arbenigwr daearegol wedi dweud y gellir rhagweld llyncdyllau mewn rhai achosion, a bod angen gwneud mwy i’w hatal.

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