thirteen

十三

Six plus seven equals thirteen, as any child can tell you.

六加七等於十三，任何小孩都答得出來。

十三歲

She started learning the violin at thirteen.

她十三歲開始學小提琴。

十三的、十三個

There are thirteen students waiting outside the classroom.

教室外面有十三個學生在等。

十三歲的

My nephew is thirteen years old this month.

我姪子這個月滿十三歲。