Ball cover and turbojet engine: what they have in common

1. Step 1. Ball cover — is part of — Ball. The casing.
2. Step 2. Ball — has part — Inner tube. A chamber with air.
3. Step 3. Inner tube — uses — Compressed air. Air.
4. Step 4. Compressed air — is used in — Ramjet. The air is compressed by the oncoming flow.
5. Step 5. Ramjet — works like — Turbojet engine. A turbojet without a compressor and turbine.

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