| 单词 | θ207995 |
| 释义 | society > travel > air or space travel > a means of conveyance through the air > balloons and airships > [noun] > ballast (5) ballast bag1747 ballast1784 A heavy material, typically sand or water, carried in the car or payload of a balloon or airship to steady it in flight, and jettisoned in order to… sandbag1834 spec. used as ballast; esp. for a boat or balloon. water balance1902 Aeronautics. An apparatus for maintaining balance in an airship by means of a water tank at each end, water being automatically pumped from the lower… Subcategories:— adjusting the ballast (1) |
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