Soap e truck: o que têm em comum

1. Passo 1. Soap — evoluiu para — Detergente sintético. Synthetic detergents were invented in the First World War, when fat for soap ran short.
2. Passo 2. Detergente sintético — é utilizado em — Washing machine. Detergent powder.
3. Passo 3. Washing machine — tem como parte — Shock absorber. Shock absorbers damp the drum's shaking during the spin.
4. Passo 4. Shock absorber — faz parte de — Suspension. Shock absorbers are part of the suspension.
5. Passo 5. Suspension — evoluiu de — Leaf spring. Car suspension inherited carriage leaf springs.
6. Passo 6. Leaf spring — faz parte de — Truck. Leaf-spring suspension.

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