eighty

八十

He counted to eighty before opening his eyes again.

他数到八十才再把眼睛张开。

八十岁、八十几岁常用复数

My grandmother still swims every morning in her eighties.

我奶奶八十几岁了，每天早上还是会去游泳。

八十的、八十个

Eighty students signed up for the summer exchange program.

有八十名学生报名参加暑期交换计划。