Barrel hoops e watt steam engine: o que têm em comum

1. Passo 1. Barrel hoops — faz parte de — Barril. Metal hoops pull the staves together.
2. Passo 2. Barril — funciona como — Arco. Staves squeezed by hoops hold their shape by the same compression as the stones of an arch.
3. Passo 3. Arco — é feito de — Tijolo. Arches were built of brick or stone.
4. Passo 4. Tijolo — é material para — Chaminé. Chimneys are brick.
5. Passo 5. Chaminé — faz parte de — Steam locomotive. Smoke from the firebox leaves through the locomotive's chimney.
6. Passo 6. Steam locomotive — tem como parte — Watt steam engine. A steam locomotive is driven by a steam engine.

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