- ring transportation system
- 环: ring; hoop
- 回: circle; wind
- 氧运输系统: oxygen transport system
- 运输系统: belt line; conveyance system; conveying systerns; conveyor system; tra ort systems; tra ortation system; traffic system; transit system; transport chain; transport systems; transportation systems; transporting system
- 材料运输系统: material conveying system
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