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.
警方已经封锁了跑道，并表示目前还不清楚这到底是一起事故还是抢劫未遂。
Police have sealed off the runway and say it is unclear if it was an accident or an attempted robbery.
因此，直到最近发现蜥脚类恐龙筑巢地的化石之前，科学家们还不能确定蜥脚类动物到底是产卵还是胎生。
Until the recent discovery of fossilized sauropod nesting grounds, scientists were thus uncertain whether sauropods laid eggs or gave birth to live young.
研究者们还需要判断嗅觉到底是一种还是两种感觉，一种感觉回应气味本身，另一种感觉记录空气中无味的化学成分。
Researchers have still to decide whether smell is one sense or two—one responding to odours properly and the other registering odourless chemicals in the air.
长期以来，研究恐龙生理学的科学家们一直在争论恐龙到底是温血动物还是冷血动物。
Scientists studying the physiology of dinosaurs have long debated whether dinosaurs were warm- or cold-blooded.
我们到底还是决定不离开。
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.
确定你到底想开发什么类型的应用，不管它是游戏，工具还是其它什么东西。
Specify the type of app you want to produce – whether it is a game, utility or anything else.
这就是用标记在等高线的地方，这些标记将告诉我们，到底是在上升还是下降。
OK, so that's where we use, actually, the labels on the level curves that tell us whether things are going up or down.
热力学在问你们，到底是系统对环境做功，还是环境对系统做功？
Thermodynamics is asking you, what work does this thing do on the surroundings or the surroundings do on the system?
它似乎难以决定到底是改进737的发动机，还是彻底重新设计该机型。
They seem to be in trouble about whether to re-engine the 737 or redesign it altogether.
这个例子的结果，从任何角度去看，都很难了解到底是谁胜出了还是谁获利了。
From any perspective, it is hard to understand who won or who benefited by the result achieved in this case.
我想手术是一个大的冒险，所以我必须决定到底做还是不做。
I think surgery is a big risk, so I had to decide [whether or not to get fillers].
他们不明白，到底是布鲁塞尔说了算，还是27个首都说了算？
They do not understand whether Brussels has the final say, or the 27 capitals all share the final say?
没有人真正知道加州州长阿诺·施瓦辛格到底是在开玩笑还是认真的。
ONE never quite knows whether Arnold Schwarzenegger, California's governor, is joking or serious.
到底沃伊尼克手稿是遗落文明的证据还是精心编制的骗局？
Is the Voynich Manuscript evidence of a forgotten civilization, or merely an elaborate hoax?
你不清楚这到底会成为一场百米冲刺还是马拉松。
You don't know if this is going to be a sprint or a marathon.
它所应得的奖到底是归于科幻还是非科幻类？
Is the prize it deserves to win to be for fiction or non-fiction?
盟军的飞机到底该什么时候开火呢，是卡扎菲进之时还是不论他们身在何处？
Are the coalition's jets supposed to clobber Libya's forces wherever they are or only when they are advancing?
它们到底是从100个太阳的质量开始，还是从100万个太阳的质量开始？
Do they start from 100 solar masses or a million solar masses?
鸠山到底会是独立自主，还是成为小泽的傀儡还不得而知。
Whether Mr Hatoyama will emerge as his own man or a puppet of Mr Ozawa is unclear.
到底是出钱还是出力取决于捐赠者的目的所在。
Whether it is better to give money or time depends on your goals as a donor.
然而，研究确实提到，到底是使用空间导航促进了海马体，或者还是活跃的海马体刺激某人使用空间导航，这一点还是不清楚。
However, the study did note that it was unclear whether using spatial navigation boosts the hippocampus, or if an active hippocampus motivated someone to use spatial navigation.
人们反复问：南苏丹到底是一个各民族平等的国家还是一个丁卡州？
A question keeps cropping up: is South Sudan a nation of equals or a Dinka state?
人们反复问：南苏丹到底是一个各民族平等的国家还是一个丁卡州？
A question keeps cropping up: is South Sudan a nation of equals or a Dinka state?
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