Barrel hoops y Máquina de vapor de Watt: qué tienen en común

1. Paso 1. Barrel hoops — forma parte de — Barril. Metal hoops pull the staves together.
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 — Chimenea. Chimneys are brick.
5. Paso 5. Chimenea — forma parte de — Locomotora a vapor. Smoke from the firebox leaves through the locomotive's chimney.
6. Paso 6. Locomotora a vapor — tiene como parte — Máquina de vapor de Watt. A steam locomotive is driven by a steam engine.

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