#1: Author: enjoywater, Posted: 2006-7-05 20:59
二十四小时全黑夜又是从一年的哪天到哪天？
谢谢。
#2: Author: 天色, Posted: 2006-7-11 23:50
北极圈白昼 5-8月
#3: Author: pipi, Posted: 2006-7-28 10:21
北极圈上就夏至那天是24小时白天
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