hopeful and confident about the future 乐观的,乐观主义的 the optimistic mood of the Sixties. 六十年代的乐观主义情绪。 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 previous estimates of whale numbers may be wildly optimistic. 以前对鲸鱼数量的估计可能过于乐观。