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What is a tunnel?
A passageway under the ground or through a hill or under a building, road, or river.
What is a tower?
A tall, narrow building or structure.
What is an escalator?
A moving staircase.
What is a station?
A place where trains or buses stop.
What is a metro?
An underground railway system.
What is a skyscraper?
A very tall building, often with many stories.
What is construction?
The building of something, typically a large structure.
What is steel?
A strong, hard, metallic (iron with carbon) element.
What is a bridge?
A structure built over a road, railway, river, or other obstacle.
What is a rail?
A metal bar or track on which vehicles, such as trains, run.
What is a surface?
The outside part or outermost layer of something.
What is engineering?
The branch of science and technology of designing, building, and using engines, machines, and structures.
What is a panel?
A flat, thin piece of material, usually rectangular, often used for decoration (door, wall, or ceiling) or control.
What is a dam?
A barrier built across a river or stream to control the flow of water.
What is a crane?
A machine used for lifting heavy objects.