Metro e turbine: o que têm em comum

1. Passo 1. Metro — utiliza — Railway track. It runs on rails.
2. Passo 2. Railway track — utiliza — Rolling mill. Rails are rolled.
3. Passo 3. Rolling mill — utiliza — Water wheel. The first mills were turned by water.
4. Passo 4. Water wheel — evoluiu para — Turbine. The water turbine evolved from the water wheel.

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