Concepts: light, ray, silhouette
A: rays of light and silhouettes of voyage
Concepts: commuter, escalator, travel
A: commuters travelling up and down the escalators at an underground station
Concepts: ecology, interaction, occur, organism, study
A: ecology the study of interactions that occur among organisms and their environment .
Concepts: bear, chase, forest
A:
A man in the forest is being chased by a bear.