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The competition heats up: The chief engineer of China’s manned program revealed that they are building an unmanned cargo freighter for their next space station, Tiangong-2, with both scheduled for launch in 2016.
Essentially the Chinese are repeated the steps the Russians took, adding docking ports to each new station module. The second will have two docking ports, one for manned craft and the second for cargo. Later modules will have multiple ports to which additional modules can be added.