Railway track e computador: o que têm em comum

1. Passo 1. Railway track — é utilizado em — Metro. It runs on rails.
2. Passo 2. Metro — utiliza — Tunnelling shield. Metro tunnels were built with shields.
3. Passo 3. Tunnelling shield — utiliza — Hydraulic cylinder. The shield was pushed forward by jacks.
4. Passo 4. Hydraulic cylinder — faz parte de — Simulador de voo. A motion platform.
5. Passo 5. Simulador de voo — utiliza — Computador. Modern simulators are computer-based.

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