Nuclear power plant e barril: o que têm em comum

1. Passo 1. Nuclear power plant — é um tipo de — Power station. A power station.
2. Passo 2. Power station — é feito de — Tijolo. The buildings of the first power stations were brick.
3. Passo 3. Tijolo — é material para — Arco. Arches were built of brick or stone.
4. Passo 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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