jí zhòu
意思解释：（Extremely day）极圈以内的地区，每年总有一段时期太阳终日不落。
也称永昼。地球南北极圈内出现全日均为白天的特殊现象。越近两极，极昼日数越多。自春分至秋分，此现象仅出现在北极;自秋分至春分，此现象则出现在南极。…
Also say always day. Full day appears to all be diurnal special appearance inside polar circle of earthly north and south. Closer polar, extremely day day number is more. Come from spring equinox the autumnal equinox, this phenomenon appears in arctic; to come from the autumnal equinox only spring equinox, this phenomenon appears in antarctic. ...
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