Plunged in dark thought, he sat in the copilot's seat throughout the journey.

在整个飞行中，他坐在副驾驶员的座位上，全神贯注在狠毒的思索中。

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Planck data also suggest that our universe has more dark matter than previously thought.

CNN: Better 'baby picture' of universe emerges

The trustees deny deliberately keeping him in the dark, insisting they thought Hank knew he was a beneficiary, though nobody recalls telling him so.

FORBES: Black Sheep Beats Bank

We needn't accept the diagnosis, but it's hard to resist the thought that the dark view of the world that came on Churchill in his moods of desolation enabled him to see what others could not.

BBC: A Point of View: Churchill, chance and the 'black dog'