求翻译：这些现象的存在有悖于有效市场假说和无风险套利理论，被学术界冠之以“IPO异象”之名而长期受到国内外学者的关注和研究。是什么意思？

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These phenomenon existence counteracts in the effective market hypothesis and the non-risk arbitrage theory, but the name is received for a long time by the academic circles crown by “the IPO heteromorphism” the domestic and foreign scholar's attention and the research.

The existence of these phenomena is contrary to the efficient market hypothesis and theory of riskless arbitrage, to be dubbed the "IPO visions" and long-term attention from domestic and overseas scholars and in the name of research.

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