Aramid ballistic panels and syringe: what they have in common

1. Step 1. Aramid ballistic panels — is part of — Body armour. Layers of aramid fabric.
2. Step 2. Body armour — works like — Tank. One idea of protection — armour — at different scales.
3. Step 3. Tank — has part — Diesel engine. Most modern tanks are powered by a diesel (the Mark I had a petrol engine).
4. Step 4. Diesel engine — has part — Piston. Pistons move in the cylinders.
5. Step 5. Piston — is part of — Syringe. A plunger.

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