Catheter and conveyor belt: what they have in common

1. Step 1. Catheter — is part of — IV drip. A catheter.
2. Step 2. IV drip — has part — Syringe. A needle.
3. Step 3. Syringe — has part — Piston. A plunger.
4. Step 4. Piston — is part of — Hydraulic cylinder. The piston is moved by liquid.
5. Step 5. Hydraulic cylinder — is part of — Tunnel boring machine. Hydraulic cylinders push the machine forward.
6. Step 6. Tunnel boring machine — has part — Conveyor belt. Spoil is removed by a conveyor.

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