Metro et turbine : ce qu'ils ont en commun

1. Étape 1. Metro — utilise — Railway track. It runs on rails.
2. Étape 2. Railway track — utilise — Rolling mill. Rails are rolled.
3. Étape 3. Rolling mill — utilise — Water wheel. The first mills were turned by water.
4. Étape 4. Water wheel — a évolué en — Turbine. The water turbine evolved from the water wheel.

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