| 单词 | 非常黑 |
| 释义 | 〔whiteout〕A polar weather condition caused by a heavy cloud cover over the snow, in which the light coming from above is approximately equal to the light reflected from below, and which is characterized by absence of shadow, invisibility of the horizon, and discernibility of only very dark objects.乳白天空：一种由于大朵浓密云团覆盖住积雪而产生的极地大气状况，此种情况下来自上空的光线几乎与从下界映射的光线相等，特征为没有阴影，辨认不清地平线，只能认出非常黑的物体 |
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