Streamline
The art of streamlining
Streamlining
If you make something more streamline that means it has less friction on it's surface and has got less air resistance. The reason this is useful is because it means that things like racing cars can go faster and swimmers can swim faster.
^---- Streamline ----^
How to make something more streamlined.
To make something more streamlined you can make sure that the surface of the object has a 'shiny' or 'slippery' surface so that the air slides off of the object causing less friction and less air resistance. Another way of doing this is to do as the image says; shape the object so that the air will be moved and not stopped, even creating bypasses in the structure for the air to travel through, instead of forcing it to go around, would help.
Note
I spent more than half an hour on this homework. I'm sorry if it doesn't look like much.