Steel shield shell and car: what they have in common

1. Step 1. Steel shield shell — is part of — Tunnelling shield. A steel cylinder that holds back the ground.
2. Step 2. Tunnelling shield — uses — Hydraulic cylinder. The shield was pushed forward by jacks.
3. Step 3. Hydraulic cylinder — is part of — Hydraulic brake. Wheel cylinders press on the shoes.
4. Step 4. Hydraulic brake — is used in — Car brake. Brake actuation.
5. Step 5. Car brake — is part of — Car. Brakes stop the car.

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