Concepts: harbor, sea, sky
A: boats moored at the harbor against clear blue sky with peaceful sea in the foreground
Concepts: airplane, drive, runway
A: Airport security drives past airplane on the runway
Concepts: carry, life, organism
A: cell the smallest unit of an organism that carries on the functions of life
Concepts: direction, ski, skier
A:
A large group of skiers are skiing close together in the same direction.