Folding legs e tunnelling shield: o que têm em comum

1. Passo 1. Folding legs — faz parte de — Ironing board. Scissor supports.
2. Passo 2. Ironing board — é feito de — Algodão. Covered with a cotton cover.
3. Passo 3. Algodão — é material para — Wright Flyer. The covering is muslin.
4. Passo 4. Wright Flyer — utiliza — Railway track. The Flyer had no wheels: it took off along a wooden rail.
5. Passo 5. Railway track — é utilizado em — Metro. It runs on rails.
6. Passo 6. Metro — utiliza — Tunnelling shield. Metro tunnels were built with shields.

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