one-third ☊ like: một phần ba → →
das Drittel ☊ 
một phần ba ☊ 
☊ More than a third of Britain's bird species need urgent protection. ☊ bird ☊
One third of the world's population consumes/consume two thirds of the world's resources. ☊ population ☊
Up to a third of one's life is now being spent in retirement. ☊ retirement ☊