Rabies vaccine and tunnelling shield: what they have in common

1. Step 1. Rabies vaccine — is a kind of — Vaccine. A vaccine.
2. Step 2. Vaccine — uses — Syringe. Injections.
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 used in — Tunnelling shield. The shield was pushed forward by jacks.

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