回复：Please post a picture of natural 圆形彩虹.

来源: guest007 于 2010-08-10 18:32:35 [] [旧帖] [给我悄悄话] 阅读数 : (130 bytes)
回答: 回复：你见过向上弯的彩虹吗？ 由 guest007 于 2010-08-10 11:19:25

as 布衣之才 mentioned, if you know how it is formed, you can understand why round is also possible.

just try google images.

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