Recently, physicists trying to meld gravity and quantum theory, and so explain the nature of space and time, have begun to revisit this old question.

最近，物理学家试图把引力和量子理论融为一体，由此来解释空间和时间的性质，已经开始重新研究这个老问题。

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This turbulence and pace of change has also led many organisations to revisit the nature of how they innovate.

BBC: Viewpoint: Why disruption is good for business

What if it is part of human nature to complicate matters further rather than revisit the foundation on which many of our vested interests are based?

FORBES: Astronomy and the Federal Tax Law