Earth based radar observations hint at possible water ice in the pole craters, possible only because of permanent shadow.
地球上的雷达观测暗示,在极陨石坑可能的水冰,不仅是因为永久阴影可能。
Finding the North Pole was "rather like stepping on the shadow of a bird hovering overhead."
踏进北极就象把脚踏上在空中盘旅程的鸟的影子一样。
Finding the North Pole was "rather like stepping on the shadow of a bird hovering overhead."
踏进北极就象把脚踏上在空中盘旅程的鸟的影子一样。
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