Gun barrel and monitor: what they have in common

1. Step 1. Gun barrel — is part of — Anti-aircraft gun. A long barrel.
2. Step 2. Anti-aircraft gun — uses — Radar. Radar guidance.
3. Step 3. Radar — works like — Sonar. The same echolocation principle: sound in water instead of radio waves.
4. Step 4. Sonar — works like — Ultrasound scanner. A medical sonar: the same echo principle.
5. Step 5. Ultrasound scanner — has part — Monitor. A screen.

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