Ultrasound scanner and turbojet engine: what they have in common

1. Step 1. Ultrasound scanner — works like — Sonar. A medical sonar: the same echo principle.
2. Step 2. Sonar — works like — Radar. The same echolocation principle: sound in water instead of radio waves.
3. Step 3. Radar — is part of — Jet fighter. A radar.
4. Step 4. Jet fighter — has part — Turbojet engine. A turbojet.

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