Cargo aircraft and freezer: what they have in common

1. Step 1. Cargo aircraft — has part — Turboprop. Turboprop engines for short runways.
2. Step 2. Turboprop — is a kind of — Gas turbine. A gas turbine.
3. Step 3. Gas turbine — has part — Compressor. A compressor.
4. Step 4. Compressor — is part of — Freezer. A compressor compresses the refrigerant.

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