Bridge and turbine: what they have in common

1. Step 1. Bridge — includes — Suspension bridge. A bridge.
2. Step 2. Suspension bridge — is made of — Wrought iron. The chains of early suspension bridges were made of wrought iron.
3. Step 3. Wrought iron — is material for — Ocean liner. The hull is iron, later steel.
4. Step 4. Ocean liner — has part — Turbine. Large liners run on steam turbines.

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