Benim şehrin nüfusu bu şehrin üçte ikisi kadar büyüktür.
- The population of my city is about two-thirds as large as that of this city.
Öğrencilerin üçte ikisi toplantıya geldi.
- Two-thirds of the students came to the meeting.
... two-thirds of the history of the universe has already passed. ...
... oxygen-- it's two-thirds oxygen, one-third fuel-- ...