The principle of fungibility does not imply that project evaluation is an empty exercise . 可替代性原理并不意味着项目估价是徒劳的。
Ardan was about to propose abandoning this useless pursuit, when all at once maston stopped . 阿当正打算提议放弃这种徒劳的侦察，梅斯顿突然停了下来。
No one who isn't directly involved would ever believe the incredible duplication and futility . 不直接卷入的人没有一个会相信这种不可置信的重复和徒劳。
As we traveled from island to island, we searched the cliffs and rocks in vain for nesting puffins . 我们从一个岛走到另一个岛，在峭壁上和岩石间寻找海鸭，但却枉费徒劳。
It would therefore be futile to attempt to see or photograph the interference pattern resulting from two light bulbs . 因此要想看到或者摄得由两个灯泡所产生的干涉图样将是徒劳的。
She must have known that her attempts to convince others would remain hopeless and might even interpreted as pretentious . 她一定知道，她想说服别人是徒劳的，甚至还可能被认为是自负。
If we were to try burying our detectors in order to attenuate the surface waves, we would soon grow discouraged . 如果企图用埋置检波器的方法来衰减面波，很快就会发现这种做法是徒劳的。
In vain they rush frantically round from place to place , trying to escape from avenging boredom by mere clatter and motion . 他们徒劳地狂躁地到处跑动，想通过咿哩哇喇和活动肢体来摆脱成为报应的无聊。
She now distinctly saw two or three figures already so near to her, that a precipitate flight would have been equally fruitless and impolitic . 她现在能够看清两三个人影已经离她不远，再要仓促逃跑不仅是徒劳，而且未免失策了。
