Diesel engine and sewage treatment plant: what they have in common

1. Step 1. Diesel engine — has part — Turbocharger. Modern diesels are turbocharged.
2. Step 2. Turbocharger — has part — Compressor. A compressor.
3. Step 3. Compressor — is part of — Sewage treatment plant. Blowers supply oxygen to the microbes.

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