Although very hot, prominences typically appear dark when viewed against the Sun, since they are slightly cooler than the surface.

虽然很热，日珥典型表现是在太阳的衬托下显得较暗，因为它们比太阳表面稍冷一些。

youdao

Dark glasses screened his eyes from the sun.

他戴了一副墨镜，保护眼睛不受阳光照射。

《牛津词典》

The men and the women had to do all their work before sunset. After the sun went down, it was too dark to do farm work or housework.

男人和女人必须在太阳下山前做完所有的工作， 太阳下山后， 天就黑了， 不能再做农活和家务了。

youdao

That's because as the Earth moves around the Sun, it is moving into a stationary field of dark matter - and for half the year it will be moving against the tide of dark matter - just like driving into the rain.

BBC: Dark Matter: Experiment to shed light on dark particles

There is no sign to mark it, just a sprawl of heavy, dark, tropical hardwood left to dry and age in the sun and a couple of half-finished canoes in front of the open-air shed where he does his work.

BBC: A tale of the South Pacific