This kind of dark material will highlight the brightness of your complexion.

这种深色面料，能衬托您皮肤的明亮光彩。

youdao

Compost is a dark, rich material added to soil to improve it.

VOA: special.2009.06.23

Odd patches of bright and dark material that scientists have yet to identify also appear on its surface.

WSJ: Asteroid Vesta Gets a Close Study

In these areas, the water appears to be covered by a dark material that the researchers suspect might be complex organic molecules.

FORBES: NASA Has Discovered Water Ice On Mercury

But further measurements using a laser and looking for reflections showed that much of the ice is covered with a layer of dark material tens of centimetres thick.

BBC: Mercury's water ice at north pole finally proven