Their efforts to revive him were futile.
他们对他抢救
效。
效
, 
, 
义, 益;义;;;,使达不到预期目
;;;;义;效;,不明智;Their efforts to revive him were futile.
他们对他抢救效。
He is a futile sort of person.
他是一个没有
人。
They were killed, to the last man, in a futile attack.
因为进攻失败, 他们全部被杀, 一幸免。
Without microscopes and other modern equipment, attempts to teach science were futile.
没有显微镜及其他现代化设备, 想教授自然科学是不会有成果。
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