CONCEPTS: attach, chain, padlock, wall

GEN: locked door with padlock and chain attached to a rock wall

CONCEPTS: communicate, language, mouth, word

GEN: A young girl is using sign language to communicate, while mouthing the words.

CONCEPTS: bridge, train, travel

GEN: Train and vehicle traffic travels across a bridge.

CONCEPTS: boulder, elevation, motion, rainforest, stream

GEN:
stream flowing in slow motion among boulders through montane rainforest at elevation