Footwear e railway track: o que têm em comum
- Passo 1. Footwear — é feito de — Leather. Leather.
- Passo 2. Leather — é material para — Biga. The floor was woven from leather straps.
- Passo 3. Biga — evoluiu de — Carro. A chariot is a lightened cart.
- Passo 4. Carro — faz parte de — Wagonway. Wagons rolled on the rails.
- Passo 5. Wagonway — evoluiu para — Railway track. Cast-iron and steel rails replaced wooden ones.