Walkie-talkie and boyle’s air pump: what they have in common

1. Step 1. Walkie-talkie — has part — Antenna. An antenna.
2. Step 2. Antenna — is part of — Television set. An antenna.
3. Step 3. Television set — has part — Cathode-ray tube. A picture tube.
4. Step 4. Cathode-ray tube — uses — Vacuum. Inside is a vacuum.
5. Step 5. Vacuum — is used in — Boyle’s air pump. The pump draws out the air.

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