Ferry and micrometer: what they have in common

1. Step 1. Ferry — has part — Bow thruster. Thrusters.
2. Step 2. Bow thruster — has part — Propeller. A propeller in a tunnel.
3. Step 3. Propeller — uses — Screw. A propeller “screws” itself into the water, like an Archimedes’ screw.
4. Step 4. Screw — is used in — Micrometer. A precise screw with a 0.5 mm pitch.

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