Barrel heads y red eléctrica: qué tienen en común

1. Paso 1. Barrel heads — forma parte de — Barril. End caps.
2. Paso 2. Barril — funciona como — Arco. Staves squeezed by hoops hold their shape by the same compression as the stones of an arch.
3. Paso 3. Arco — está hecho de — Ladrillo. Arches were built of brick or stone.
4. Paso 4. Ladrillo — es material para — Central eléctrica. The buildings of the first power stations were brick.
5. Paso 5. Central eléctrica — forma parte de — Red eléctrica. Power stations feed the grid.

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