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bod yn agored i effeithiau marwol mwg tybaco yw achos pennaf marwolaethau cynnar y gallesid eu hatal yng nghymru
exposure to the lethal effects of tobacco smoke is the biggest cause of preventable early death in wales
byddwch yn ymwybodol hefyd mai'r cynnydd mewn prisiau olew crai oedd achos pennaf y prisiau tanwydd uwch
you will also be aware that the increase in fuel prices was largely the result of an increase in crude oil prices
clywsom fod cartrefi oer , llaith yn cynyddu iechyd gwael , ac mai cartrefi anniogel yw pennaf achos damweiniau
we have heard that cold , damp homes increase ill-health , and that unsafe homes are the biggest cause of accidents
diben pennaf sefydlu canolfannau cyswllt oedd hwyluso cysylltiad ar gyfer y rhieni absennol hynny nad oedd ganddynt unrhyw le arall i gwrdd
contact centres were largely established with the intention of facilitating contact for those absent parents who had no other available meeting venue