舍伦贝格没有告诉他的助手自己到底想证明什么。
Schellenberg didn't tell his assistants what exactly he was trying to prove.
有人能确定这种下降到底是由捕猎还是气候变化引起的吗?
Can anyone be sure if the decline is really caused by the hunting or by climate change?
广告经理关键要决定到底是“硬销售”还是“软销售”策略适合特定的目标市场。
A key decision required of advertising managers is whether a "hard-sell" or "soft-sell" strategy is appropriate for a specific target market.
正如你所知道的，研究人员一直对发现动物到底有多聪明很感兴趣。
As you know, researchers have long been interested in discovering exactly how intelligent animals are.
大多数当代物理学家都不相信人类能够发现这些神秘的力量到底是什么。
Most contemporary physicists reject the notion that man can ever discover what these mysterious forces "really" are.
几个小时后，当她来告别时，家人要求她解决他们一直在争论的问题，即她到底给了什么建议。
A few hours later, when she came to say goodbye, the family asked her to settle an argument they've been having over exactly what advice she had given.
一场关于到底发生了什么事的辩论开始了。
我选英语文学是因为当我刚上大学的时候，我不知道自己到底想做什么。
I chose English Literature because when I started off a university, I didn't know what it was I wanted to do.
这个想法来自圣安德鲁斯大学的科学家，他挑战性地要找出火焰里到底是什么。
The idea comes from a St Andrews University scientist challenged to find out just what is inside a flame.
当我们认真看那些网站的时候，我们看到了那种狂躁不安，困惑于到底学校的课堂对这些孩子们意味什么。
When we look on the web, we see that sense of furious anxiety about what school classroom means to these kids.
虽然赢得比赛的机会微乎其微，但全队成员都选择了坚持到底。
Though there was only a slim chance to win the game, all of the team members chose to stick to the end.
那么，当“谢谢”只是表达感激的第20种常用方式时，你到底应该说什么呢？
So, what exactly are you supposed to say when "thank you" is only the 20th most popular way to express gratitude?
动物到底为什么要玩耍，这个问题仍然在文献中存在争议，并且每个物种玩耍的原因也不尽相同。
Exactly why animals play is still a matter debated in the research literature, and the reasons may not be the same for every species that plays.
要是我们有一个确切的数字反映这个国家到底有多少人没有工作就好了。
It would be very nice if we had a true figure of how many people in this country haven't got a job.
我知道你挺沮丧的，但说到底，事情并没什么大不了的。
I know you're upset, but when all's said and done it isn't exactly a disaster.
到底怎么回事？我不会回家的。
吃晚饭的时候，他的情绪一直很高涨，他的姨妈都在想这孩子到底怎么了。
All through supper his spirits were so high that his aunt wondered what had got into the child.
TimHensley的《沃利·格罗皮乌斯》大概是我今年最喜爱的漫画小说，我也正在试图搞明白它到底是什么。
Tim Hensley's "Wally Gropius" was maybe my favorite graphic novel of the year, and I'm still trying to figure out what exactly it is.
试着去理解到底发生了什么，而不是根据你的臆想去行动。
Try to understand what's actually happening instead of acting on the assumption you've made.
探索地平线之外到底有什么的好奇心把早期的波利尼西亚人第一次带到夏威夷海岸，同样的好奇心又驱使当今的天文学家们去探索太空。
The same curiosity to find what lies beyond the horizon that first brought early Polynesians to Hawaii's shores inspires astronomers today to explore the heavens.
当我们讲到生物力学和细胞悬浮在凝胶中的时候，我们会讲到凝胶到底是什么。
We'll talk about exactly what a gel is later when we talk about biomechanics and cells are suspended within it.
"没有图片能展示金字塔的建造过程，所以就没有办法判断到底发生了什么。
There are no pictures showing the construction of the pyramids, so there is no way to tell what really happened.
我拿不准博到底是何意图，直到后来我朝我的汽车走过去时，仔细地看了看他的敞蓬小货车，我才全明白了。
I wasn't sure what to make of Bo until I took a closer look at his pickup on my way back to the car.
对学生在学校所学内容进行研究后，发现了学生的学习到底有何缺失。
Research into what students learn in school has found just how much is missing in their studies.
这个物种的成虫深入到底层中，那里更凉爽，也许也更湿润。
Adults of this species burrow deeply into the substrate where it is cooler and perhaps moister.
说到底，这只是一种华丽的说法，表明如何发挥领导力是没有简单的答案的。
Ultimately that is just a fancy way of saying that leadership offers no easy answers.
说到底，在这一方面由学生自主选择就是导致问题出现的首要原因。
After all, students making their own choices in this respect is what caused the problem in the first place.
如果人们拥有的太少或太多导致了环境的恶化，我们就不得不思考到底多少才算足够。
If environmental destruction results when people have either too little or too much, we are left to wonder how much is enough.
研究者们承认他们的研究没有解决的问题是：针对企业社会责任各大企业到底该支出多少费用。
Researchers admit that their study does not answer the question of how much businesses ought to spend on CSR.
许多年轻的研究人员，尤其是那些没有接受过开放科学指导的人，并不确定到底是该分享还是保密。
Many young researchers, especially those who have not been mentored in open science, are uncertain about whether to share or to stay private.
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