Waistband and refrigerator: what they have in common

1. Step 1. Waistband — is part of — Trousers. The upper edge.
2. Step 2. Trousers — uses — Needle. Trousers were sewn with a needle.
3. Step 3. Needle — is part of — Syringe. A hollow needle.
4. Step 4. Syringe — is used in — Vaccine. Injections.
5. Step 5. Vaccine — uses — Cold chain. Cold storage.
6. Step 6. Cold chain — uses — Refrigerator. Refrigerators.

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