Cover and turbojet engine: what they have in common

1. Step 1. Cover — is part of — Body armour. A carrying cover.
2. Step 2. Body armour — works like — Tank. One idea of protection — armour — at different scales.
3. Step 3. Tank — has part — Gas turbine. Some tanks (T-80, Abrams) have a gas turbine engine.
4. Step 4. Gas turbine — includes — Turbojet engine. A turbojet is a gas turbine that produces thrust with a jet.

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