Soon the northern lands will be locked in the cold of the polar night.

很快北国疆土就会被极夜的寒冷所吞没。

youdao

This difference allows the satellite to capture a year-round sea ice record, despite cloud cover and months of polar night.

这种差别使得卫星能够获取整年的海冰记录，除非出现云层遮蔽或极夜的月份。

youdao

Polar mesospheric, or noctilucent ("night shining"), clouds usually are seen at twilight, following the setting of the sun below the horizon and darkening of Earth's surface.

极地气层云，或者说晚霞，通常是那些在黎明前看到的云朵，伴随着地平线以下落幕的太阳和黑暗的地球表面。

youdao

Depending on the capricious whims of the extreme Arctic climate and calendar, thick clouds reveal remote fragments of the landscape as if concealing some great mystery, blinding sunshine illuminates the ice, or perpetual moonlight bathes it all in the strange, blue half-light of the polar night.

BBC: Drawing near to the North Pole