Analysis of information sources in references of the Wikipedia article "硬式飛船" in Chinese language version.
In general, airships fall into one of two categories: pressurized or rigid. With pressurized models, the shape of the hull is maintained by a small pressure differential between the internal lifting gas and the external atmosphere. With rigid airships, the hull is formed by a lightweight skeletal structure with a fabric skin, while the lifting gas is stored in internal “gasbags”. The Graf Zeppelin II and the Hindenburg were both rigid airships. Pressure airships are sometimes made “semi-rigid” by adding a structural keel to share the bending loads generated from aerodynamic forces.
In general, airships fall into one of two categories: pressurized or rigid. With pressurized models, the shape of the hull is maintained by a small pressure differential between the internal lifting gas and the external atmosphere. With rigid airships, the hull is formed by a lightweight skeletal structure with a fabric skin, while the lifting gas is stored in internal “gasbags”. The Graf Zeppelin II and the Hindenburg were both rigid airships. Pressure airships are sometimes made “semi-rigid” by adding a structural keel to share the bending loads generated from aerodynamic forces.
