Container doors with locking bars and sewage treatment plant: what they have in common

1. Step 1. Container doors with locking bars — is part of — Shipping container. End doors.
2. Step 2. Shipping container — is used in — Truck. A container moves from ship to truck without being unloaded.
3. Step 3. Truck — has part — Air brake. Air brakes, as on trains.
4. Step 4. Air brake — has part — Compressor. A compressor pumps the air.
5. Step 5. Compressor — is part of — Sewage treatment plant. Blowers supply oxygen to the microbes.

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