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You will feel more buoyant and optimistic about the future than you have for a long time.

对于未来，你会比很久以来所感受到的更加快活、乐观。

《柯林斯英汉双解大词典》

Meanwhile on a trip to Chile, British Prime Minister Gordon Brown said it is easy to be cynical about the summit, but he remains optimistic a meaningful outcome can and must be achieved.

另一方面，正在智利访问的英国首相布朗说，人们对20国集团峰会的结果持怀疑态度并不奇怪，不过他仍然乐观地相信，这次峰会能够产生有意义的成果，而且这是必须要实现的目标。

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The father of captive Israeli soldier Gilad Shalit is not optimistic about his son's release, despite a videotape published on Friday showing for the first time that he is alive and well.

VOA: standard.2009.10.03

As we saw in the last lecture, the elder brother holds an entirely different theory of chastity, and of course, it's a lot more optimistic.

我们上一讲中看到,年长的哥哥对贞节有完全不同的看法，当然那是乐观许多的。

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Perhaps you are a little bit more optimistic, a little bit more utopian-- human nature can be improved.

也许你更乐观，更加乐天，人性可以改善。

哈佛公开课 - 幸福课课程节选

Speaking in Hungary today, Russian President Vladimir Putin said he was still optimistic a compromise could be reached.

NPR: Iran Refuses Key Condition in Russia Nuclear Talks

Councillor Jen Powell said she was optimistic a festival would be held.

BBC: Guildford has high hopes for new music festival

The head of the UN's panel of climate experts, Rajendra Pachauri, said he was now very optimistic a deal could be reached in Copenhagen.

BBC: Commonwealth leaders back climate change fund