Retractable landing gear and solar panel: what they have in common

1. Step 1. Retractable landing gear — is a kind of — Landing gear. Landing gear.
2. Step 2. Landing gear — has part — Pneumatic tyre. Aircraft tyres.
3. Step 3. Pneumatic tyre — is part of — Electric car. An electric car’s wheels have pneumatic tyres.
4. Step 4. Electric car — has part — Inverter. An inverter powers the traction motor.
5. Step 5. Inverter — is part of — Solar power station. Inverters convert direct current into alternating current.
6. Step 6. Solar power station — has part — Solar panel. A field of panels.

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