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the incidence of heart disease in the contented , working man -- which is how he used to be described -- was lower than in the stressed , middle-class executives
nid oedd clefyd y galon mor gyffredin i'r dyn dosbarth gweithiol bodlon -- dyna sut yr arferid ei ddisgrifio -- ag yr oedd i'r dyn proffesiynol dosbarth canol dan straen