N excessive hopefulness or confidence 过分乐观
But they did make one avoidable mistake that led directly to their overoptimism.
但是他们的确犯了一个能够避免的错误，这个错误直接引导他们过于乐观。
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In equities, the widespread sell-off may have been a reaction to the overoptimism that prevailed earlier this year.
而随处可见的股票抛售行为可能是年初过度乐观派人士的反应。
The problem with overoptimism was illustrated by the investment-bank collapses of 2008.
ECONOMIST: Sometimes it helps if investors are gloomy
In an editorial accompanying the study, Dan L. Longo, an editor at the journal, suggested the varied genetic makeup of tumors described in the study stands in contrast to "overoptimism" among proponents of personalized medicine.
WSJ: 'Personalized Medicine' Hits a Bump
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