A team of researchers begins to investigate, collecting skin samples for instance, recording anything that could help them answer the crucial question: why?

一组研究人员开始调查，收集皮肤样本，记录任何可以帮助他们回答关键问题的东西：为什么？

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The crucial question is, what did you want out of survival?

关键问题是，你想从生存中得到什么？

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The crucial question is: why are commodity prices declining?

关键问题在于：物价为何下降？

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This is the crucial question for all the upmarket titles over the coming months.

BBC: NEWS | UK | Death of the broadsheet?

The crucial question is whether his ideas the ones enshrined in the counter-insurgency field manual will carry the day in Afghanistan.

NEWYORKER: General Principles

Then there is the crucial question of what the next step should be.

ECONOMIST: Sierra Leone