Servicio postal y barril: qué tienen en común

1. Paso 1. Servicio postal — utiliza — Locomotora a vapor. Mail trains.
2. Paso 2. Locomotora a vapor — tiene como parte — Chimenea. Smoke from the firebox leaves through the locomotive's chimney.
3. Paso 3. Chimenea — está hecho de — Ladrillo. Chimneys are brick.
4. Paso 4. Ladrillo — es material para — Arco. Arches were built of brick or stone.
5. Paso 5. 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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