Ostrich buries its head in the sand. You may prefer to be in the dark about some things.

因为鸵鸟喜欢把头埋在沙里，你可能喜欢在黑暗中做事情。

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It's really surprising that they should still be in the dark about such important events.

真奇怪，他们至今对那样重要的事还一无所知。

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There may not be aliens on the far side of the moon, but there are still many questions about it that we are still in the dark about, like why does the crust appear thicker on the far side?

远地侧可能没有外星人，但是那里仍然会有许多问题，我们现在仍旧不清楚。例如：为什么远地侧的地壳会更厚呢？

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However, until the ecological studies are completed, scientists will still be very much in the dark about the origins of this mysterious illness.

BBC: Africa's emerging virus threat

Having largely kept the Senate in the dark about these talks, it remains to be seen if the Obama administration will be willing to submit whatever they produce to the Senate for its advice and consent, or use the Bilateral Consultative Commission the new treaty establishes to circumvent legislators altogether.

CENTERFORSECURITYPOLICY: The denuclearizers�� dangerous ambitions

The explanation for this may lie in the enigmatic "dark energy" that scientists know so little about but which is said to be accelerating the expansion of the Universe.

BBC: NEWS | Science/Nature | Great 'cosmic nothingness' found