| 摘要 |
Passageways controlled by valves interconnect a permanent lifting-gas chamber with a high-altitude lifting-gas chamber that at low altitude may carry cargo gas, fuel gas, or ballast air. Once the high-altitude lifting-gas chamber is empty, the airship can ascend to high altitude, a portion of the lifting gas flowing from the permanent lifting-gas chamber to the high-altitude lifting-gas chamber; during descent, the transferred lifting-gas is returned to the permanent lifting-gas chamber.
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