复数： seventies

These are seventy dollars and those are thirty dollars .

这双是七十元，那双是三十元。

Ostrovsky departed from us already seventy whole years .

奥斯特洛夫斯基离开我们已经整整七十年了。

At seventy , the grandmother still dominated all these people .

七十岁的祖母仍旧是全家人的主宰。

The seven women in the study were ages sixty-five to seventy .

研究中的七女，年龄在六十至七十。

He had forty sons and thirty grandsons , who rode on seventy donkeys .

他有四十个儿子，三十个孙子，骑着七十匹驴驹。