Aeronautics. Atmospheric conditions in which both the (horizontal and vertical) visibility and the cloud ceiling are effectively zero. Cf. sense…
| 单词 | θ65408 |
| 释义 | the world > physical sensation > sight and vision > invisibility > [noun] > when visibility and cloud ceiling are zero (1) zero-zero1939 Aeronautics. Atmospheric conditions in which both the (horizontal and vertical) visibility and the cloud ceiling are effectively zero. Cf. sense… |
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