His earnings are 'directly proportional' to the number of units he sells.
The second game followed 'directly' [='immediately'] after the first.
Their house is 'directly' ahead. = It's 'directly' in front of us.
(..) Which has hitherto been completely invisible to us. Narrator: Optical telescopes Can't see the black hole directly. But the glowing, super-heated gas surrounding the black hole Sends out radio waves that can be used to make an image. Huge radio telescopes pick up (..)2010 TvShow: How the Universe Works Title: Black Holes Season: 1 Episode 2