Aeroplane and centrifugal pump: what they have in common

1. Step 1. Aeroplane — has part — Landing gear. Landing gear.
2. Step 2. Landing gear — is part of — Lunar module. Legs.
3. Step 3. Lunar module — has part — Liquid-propellant rocket engine. A descent engine.
4. Step 4. Liquid-propellant rocket engine — has part — Centrifugal pump. Turbopumps deliver the propellant.

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