Learning, as I'm sure you realise is a two way process and without a significant investment from you, all our efforts will come to nothing.

学习方面，确定们明白学习是双向过程，如果没有们大投入，们所有努都是白费。

Measure the size of a ring that fits well on the person you are buying a gift for so you won't have to ruin the surprise.

如果买戒指是用来送礼，测量方戴着刚合适戒指尺寸。这样就不会让惊喜白费心思。

That can lead to a lot of wasted effort.

这可能会导致大量努白费。

All that time researching the subject and writing was wasted. After my story was rejected, I just didn’t have the heart to stay in the office. I walked the city streets with a heavy heart. I felt tired and sad.

查资料和写东西时间都白费了。故事被拒之后，就没心情待在办公室了。怀着沉重心情走在城市大街小巷。心好累，好难过。

I believe in the wasted years of work.

相信白费掉多年苦工。

No, I do. II didn't write " superfluid helium" on this napkin for nothing.

想。特意把超流氦写在餐巾纸上可不是白费。

When he met the first of his men, he commanded them to tell the rest that there was nothing left to do but to return to the forest; that all their work had been for nothing.

当他遇到他第一个部下时，他命令他们告诉其他人返回森林，没有其他事可做了；他们所有工作都是白费。

I have been amazed by your strength and your courage, and I pledge I will not let your efforts be in vain.

努和果敢表示赞叹，在这里承诺，不会让努白费。

B. His efforts made in vain.

B. 他努白费了。

Still Matthew said nothing and Marilla had a sense of having wasted words and breath.

马修仍然一言不发，玛丽拉有种白费口舌感觉。

I must be prepared for all my work to go to nothing.

必须做好所有工作都可能白费准备。

You mean we climbed all the way up here for nothing?

意思是们爬上来这里一趟全是白费？

When pipe broke off, if the hole was too curved to lift it back out, they'd have to fill the hole up with concrete up to the 7 kilometer mark and start all over, undoing years of work each time.

当钻管断裂时， 若洞穴过于弯曲无法将其拉回，他们就不得不将洞穴用混凝土填至7公里标记处， 从头再来，每次都意味着多年工作白费。

" A young man for whom two such elders had devoted themselves would indeed be culpable if he threw himself away and made their sacrifices vain" .

“一个年轻人为两位这样长辈献身， 如果他放弃自己并让他们牺牲白费， 那确实是有罪” 。

I mean, I had students who lost two years work because we wouldn't publish a paper that they weren't able to replicate.

意思是，有些学生因为无法重复实验结果，导致两年工作白费，因为们不会发表那些他们无法复现研究论文。

The Englishman objected strenuously; but as neither the blacks nor the Arab could understand a word he said his pleas were wasted.

英国人极反。 但由于黑人和阿拉伯人一个字也不懂， 他说他请求白费了。

In the evening we had a dance. Cathy begged that he might b liberated then, as Isabella Linton had no partner; her entreaties were vain, and I was appointed to supply the deficiency.

晚上们有个跳舞会。凯蒂请求这时把他放出来，因为伊莎贝拉·林惇没有舞伴。她请求是白费，奉命来补这个缺。