Aeration tank with bubbling water and shipping container: what they have in common

1. Step 1. Aeration tank with bubbling water — is part of — Sewage treatment plant. A tank where activated sludge breaks down pollutants.
2. Step 2. Sewage treatment plant — has part — Compressor. Blowers supply oxygen to the microbes.
3. Step 3. Compressor — is part of — Air brake. A compressor pumps the air.
4. Step 4. Air brake — is part of — Truck. Air brakes, as on trains.
5. Step 5. Truck — uses — Shipping container. A container moves from ship to truck without being unloaded.

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