Worm gear and turbine: what they have in common

1. Step 1. Worm gear — is part of — Outboard motor. An angle gearbox.
2. Step 2. Outboard motor — has part — Propeller. A propeller.
3. Step 3. Propeller — is part of — Ocean liner. Propellers.
4. Step 4. Ocean liner — has part — Turbine. Large liners run on steam turbines.

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