| 摘要 |
<p>In an air balloon (1) comprising a leak-tight casing (2) consisting of one or more layers containing an inert gas (3) that is lighter than air and provided with a part (4) designed to be opened reversibly to enable deflation of the said balloon (1), this part (4) is positioned such that the axis (K-K) perpendicular to its aperture (4a) is inclined to the horizontal at an angle between 0° and 180°, but perferably at an angle equivalent to 90°.</p> |
