I doubt the feasibility of the plan.
我怀疑这个计划的可行性。
Some of them doubted the feasibility of the proposal.
有些人怀疑这一提议的可行性。
Derek persuaded me of the feasibility of the idea.
德里克让我相信这个想法是可行的。
The sheer futility of it all exasperates her.
它毫无用处，这让她很生气。
Even in ordinary life you feel the futility of words.
即使在日常的生活中你也往往能感受到言辞的无助和无效。