Gyrocompass e plough: o que têm em comum

1. Passo 1. Gyrocompass — faz parte de — Couraçado. Steel ships distort a magnetic compass.
2. Passo 2. Couraçado — tem como parte — Watt steam engine. Steam engines.
3. Passo 3. Watt steam engine — evoluiu para — Tractor. The first tractors were steam-powered.
4. Passo 4. Tractor — utiliza — Steel plough. Ploughing with a tractor.
5. Passo 5. Steel plough — evoluiu de — Plough. A steel share.

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