DOUBLE surface - glider with upper and lower sail surfaces that enclose airframe to reduce drag and improve performance.
双翼面—滑翔机机架上下两面被翼布包裹，以减少阻力和提高性能。
DOUBLE surface - glider with upper and lower sail surfaces that enclose airframe to reduce drag and improve performance.
双翼面—滑翔机机架上下两面被翼布包裹，以减少阻力和提高性能。
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