Laptop and sonar: what they have in common

1. Step 1. Laptop — has part — Display. A laptop's lid is its screen.
2. Step 2. Display — is part of — Monitor. The heart of a monitor is the display: an LCD panel, once a picture tube.
3. Step 3. Monitor — is part of — Ultrasound scanner. A screen.
4. Step 4. Ultrasound scanner — works like — Sonar. A medical sonar: the same echo principle.

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