gostwng

Mae nifer yr athrawon plant byddar yng Nghymru yn gostwng, ac nid oes unman yng Nghymru lle gallwch hyfforddi i fod yn athro plant byddar.

The number of teachers of the deaf in Wales is falling, and there is nowhere in Wales where you can train to be a teacher of deaf children.

Oherwydd pan fydd incwm ffermydd yn gostwng, mae'r effeithiau'n eang.

Because, when farm income falls, the impacts are widespread.

Mae poblogaeth y DU o bryfed hedfan wedi gostwng 60 y cant mewn 20 mlynedd.

The UK's flying insects have declined by 60 per cent in 20 years.

Ydy, mae nifer y gweithredoedd wedi gostwng, ond nid yw'r hyn sydd yno'n hawdd.

Yes, there is a reduction in actions, but what is there isn't a walk in the park.

Mae teithiau gan deithwyr Cymru wedi gostwng.

Welsh passenger journeys have declined.