Their efforts to revive him were futile.
们对
无效。
的词词
词的;
的;的;指引的,不明智的;Their efforts to revive him were futile.
们对无效。
He is a futile sort of person.
是一个没有用的人。
They were killed, to the last man, in a futile attack.
因为进攻失败, 们全部被杀, 无一幸免。
Without microscopes and other modern equipment, attempts to teach science were futile.
没有显微镜及其现代化的设备, 
教授自然科学是不会有成果的。
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