Scooter step-through body and watt steam engine: what they have in common

1. Step 1. Scooter step-through body — is part of — Motor scooter. A leg shield and floor.
2. Step 2. Motor scooter — has part — Internal combustion engine. A two-stroke engine.
3. Step 3. Internal combustion engine — evolved from — Watt steam engine. The combustion engine inherited the “cylinder — piston — crank” layout from the steam engine, moving combustion inside the cylinder.

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