Their efforts were unavailing.
他们的努力都付诸东流。
1.无益的,无用的,无效的
1.not successful
1.A week afterwards she came in one evening from an unavailing search for some light occupation in the immediate neighbourhood.
一个星期里，她都在附近的地方寻找一个轻松一点儿的工作，但是她没有找到。
2.Silent awaiting would turn out to be unavailing.
默默等待将要变成徒劳。
3.His best efforts, however, proved unavailing and the child died.
然而他尽了最大努力，还是无能为力，孩子去世了。
4.His best efforts proved unavailing and the child died.
可是，他最大的努力终究是徒劳，孩子还是死了。
5.and the sharp arrows of unavailing remorse struck home to his heart.
徒劳的悔恨好似利箭，扎人了他的心底。
6.Reluctant to say goodbye to the past sweet as we are, our efforts are unavailing.
心中再有不舍，不忍心和过去的甜蜜说再见，也于事无补了。
7.Bitter but unavailing were my regrets.
我的懊悔是痛苦而无益的。
8.he demanded , trying , as it seemed , to see with those sightless eyes - unavailing and distressing attempt
他问，似乎要用那双失明的眼睛来看无效而痛苦的尝试！