He is a futile sort of person.

他是一个有人。

Their efforts to revive him were futile.

他对他抢救无效。

They were killed, to the last man, in a futile attack.

因为进攻失败, 他全部被杀, 无一幸免。

Without microscopes and other modern equipment, attempts to teach science were futile.

有显微镜及其他现设备, 想教授自然科学是不会有成果。