Operators of the Hubble Space Telescope said the dark spot is about two times the length of the United States.

VOA: special.2009.08.25

I knew you in this dark: for so you frowned Yesterday through me as you jabbed and killed.

在黑暗中我认出了你,刺戮屠杀我的时候，你和昨天一样皱着眉。

耶鲁公开课 - 现代诗歌课程节选

I'm usually out early in the morning when it's still dark now because of the changing in the season.

我通常早上很早就出门，因为季节变换，那时天还是黑的。

中央公园的时光 - SpeakingMax英语口语达人

If one goes dark, they all go dark, like a string of Christmas lights.

FORBES

Meanwhile, in space, scientists are looking for the signatures of dark matter and dark energy.

CNN: How particle smasher and telescopes relate

Among other things, this telescope is also looking for evidence of dark matter and dark energy.

CNN: How particle smasher and telescopes relate