When the boat is navigating, the hull loses contact completely with water surface and only four wing wheels are rotating on water surface.
使船舶在产生动力的同时产生升力，船舶行驶时，船体完全脱离水面。
When the boat is navigating, the hull loses contact completely with water surface and only four wing wheels are rotating on water surface.
使船舶在产生动力的同时产生升力，船舶行驶时，船体完全脱离水面。
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