Escalator and syringe: what they have in common

1. Step 1. Escalator — works like — Conveyor belt. An escalator is a conveyor with steps.
2. Step 2. Conveyor belt — is part of — Tunnel boring machine. Spoil is removed by a conveyor.
3. Step 3. Tunnel boring machine — has part — Hydraulic cylinder. Hydraulic cylinders push the machine forward.
4. Step 4. Hydraulic cylinder — has part — Piston. The piston is moved by liquid.
5. Step 5. Piston — is part of — Syringe. A plunger.

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