Derailleur and centrifugal pump: what they have in common

1. Step 1. Derailleur — is part of — Mountain bike. Many gears.
2. Step 2. Mountain bike — has part — Suspension fork. A suspension fork.
3. Step 3. Suspension fork — has part — Shock absorber. A shock absorber.
4. Step 4. Shock absorber — is part of — Washing machine. Shock absorbers damp the drum's shaking during the spin.
5. Step 5. Washing machine — has part — Centrifugal pump. A drain pump.

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