Rocket guidance unit e tunnelling shield: o que têm em comum

1. Passo 1. Rocket guidance unit — faz parte de — Multistage rocket. Gyroscopes and a computer hold the trajectory.
2. Passo 2. Multistage rocket — é um tipo de — Rocket. A multistage rocket is a rocket that drops its empty tanks on the way.
3. Passo 3. Rocket — utiliza — Gunpowder. The first rockets were powered by gunpowder.
4. Passo 4. Gunpowder — evoluiu para — Dinamite. A replacement for gunpowder in mining.
5. Passo 5. Dinamite — funciona como — Tunnelling shield. Two ways of driving tunnels — mechanical and explosive.

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