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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The little girl thought that it was dark and nobody could see her, so she gave her dress away.

小女孩认为天很黑，没有人能看见她，所以她把自己的衣服送人了。

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"I thought perhaps it always rained or looked dark in England," Mary said.

“我以为英国不是总下雨，就是阴沉沉的。”玛丽说。

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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'