Metro und turbine: was sie gemeinsam haben

1. Schritt 1. Metro — nutzt — Railway track. It runs on rails.
2. Schritt 2. Railway track — nutzt — Rolling mill. Rails are rolled.
3. Schritt 3. Rolling mill — nutzt — Water wheel. The first mills were turned by water.
4. Schritt 4. Water wheel — entwickelte sich zu — Turbine. The water turbine evolved from the water wheel.

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