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1·I knocked loudly in the vain hope that someone might answer.

我敲门敲得很响，希望有人应声，却是徒然。《牛津词典》

2·He married his fourth wife, Susan, in the vain hope that she would improve his health.

他怀着她能改善自己健康的徒然希望娶了第4个妻子苏珊。《柯林斯英汉双解大词典》

3·At the moment, this seems a vain hope.

此时此刻，他的想法看来是徒劳的。

4·This need not be an entirely vain hope.

这并不是毫无指望的托词。

5·He wasted his time in the vain hope of persuading her.

他浪费时间徒劳的想谁服她。

6·A horse is a vain hope for deliverance; despite all its great strength it cannot save.

靠马得救是枉然的。马也不能因力大救人。

7·Here are the few things I learned in life in the vain hope that you would avoid them.

下面就是我的一点人生体会，希望你们能够有所感悟，避免走我所走过的弯路。

8·Without opposing all these and without unity and progress, resistance will be just empty talk and victory a vain hope.

不这样做，没有团结和进步，所谓抗战只是空唤，抗日胜利是没有希望的。

9·The vain hope is that in the process of studying geography, math, English, biology, and so on, students will learn to think critically.

教育者空怀着一种希望，希望学生在学习地理、数学、语文、生物学等等课程的过程中，会学会批判性思维。

10·Let no one nurse the vain hope of exploiting that example tomorrow, in the negotiations which the question of economic transformation will require.

谁也别梦想今后就经济改造问题进行协商之时援例而行。