Central nuclear y barril: qué tienen en común

1. Paso 1. Central nuclear — es un tipo de — Central eléctrica. A power station.
2. Paso 2. Central eléctrica — está hecho de — Ladrillo. The buildings of the first power stations were brick.
3. Paso 3. Ladrillo — es material para — Arco. Arches were built of brick or stone.
4. Paso 4. Arco — funciona como — Barril. Staves squeezed by hoops hold their shape by the same compression as the stones of an arch.

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