one third, a third
柯景腾学期已经过了三分之一了
Ke Jingteng is already a third of the way through the semester.
— 那些年，我们一起追的女孩 (2011)
它只有真的三分之一
It’s really only one-third.
— 世界 (2004)
我杀掉了他们三分之一还多。
I killed more than a third of them.