Oil pumpjack e kiln: o que têm em comum

1. Passo 1. Oil pumpjack — faz parte de — Oil well. It drives the sucker-rod pump.
2. Passo 2. Oil well — é feito de — Wrought iron. The casing pipes are iron.
3. Passo 3. Wrought iron — é material para — Steam locomotive. The boiler is wrought iron.
4. Passo 4. Steam locomotive — tem como parte — Chaminé. Smoke from the firebox leaves through the locomotive's chimney.
5. Passo 5. Chaminé — faz parte de — Kiln. The chimney creates a draught.

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