The challenge is to pick out oil from other dark spots, such as shadows made by clouds or patches of seaweed.
VOA: standard.2010.07.05
We like to think that our intelligence agencies are adequately equipped, staffed and authorized to wage political warfare in thedarkshadows of black operations around the world, but this is wishful thinking.
The deaf-mute helped my grandfather to his feet and led him to the door, where he could see thedark field swimming with shadows: the villagers, the snowdrifts, the fence.