Aerosol can and car: what they have in common

1. Step 1. Aerosol can — has part — Valve. A valve.
2. Step 2. Valve — is part of — Carburettor. A throttle valve in the carburettor sets how much fuel-air mix reaches the engine.
3. Step 3. Carburettor — is part of — Car. In older cars the carburettor mixed petrol with air for the engine.

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