Drip irrigation and diesel engine: what they have in common

1. Step 1. Drip irrigation — uses — Valve. Drippers.
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 — evolved into — Fuel injection. Fuel injection replaced carburettors.
4. Step 4. Fuel injection — is used in — Diesel engine. A diesel is a fuel-injection engine.

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