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自然奇觀/登山者遇罕見環形彩虹 人去環空~
Sep 28th 2013, 10:45, by service.nownews@gmail.com (nownews)
〔大陸新聞中心/綜合報導〕日前33歲的業餘登山員山姆·克拉克(Sam Clack)在爬上英國威爾士西北部的斯諾登峰後,驚喜地見到了環形彩虹。此現象是由日光的衍射形成,對太陽的相對位置,雲霧的濃度和濕度都有要求,因而十分難得見到。 閱讀全文...
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