Winch drum and sewage treatment plant: what they have in common

1. Step 1. Winch drum — is part of — Windlass. A cylinder on which the rope is wound.
2. Step 2. Windlass — is part of — Drawbridge. Raised with a windlass.
3. Step 3. Drawbridge — is a kind of — Bridge. A bridge.
4. Step 4. Bridge — is part of — Interchange. Flyovers.
5. Step 5. Interchange — is made of — Concrete. The flyovers are concrete.
6. Step 6. Concrete — is material for — Sewage treatment plant. The tanks are concrete.

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