third

A third of the students in the class were absent due to the flu.

(Chinese) 班里有三分之一的学生因为流感缺席。

Cut the pie into equal parts so that everyone gets one third.

(Chinese) 将派切成等份，这样每个人都能分到三分之一。

Our office is located on the third floor of this office building.

(Chinese) 我们的办公室位于这栋办公楼的三层。

This is the third time he has forgotten his house keys this week.

(Chinese) 这是他本周第三次忘记带家里钥匙了。