hopeful and confident about the future
乐观的,乐观主义的
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the optimistic mood of the Sixties 六十年代的乐观主义情绪
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he was optimistic about the deal .他对交易抱乐观态度。
involving an overestimate
(估计)过于乐观的,高估的
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previous estimates of whale numbers may be wildly optimistic .以前对鲸鱼数量的估计可能太过乐观。