optimist [ˈɒptɪmɪst]

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n.乐观的人，乐观主义者

someone who always believes that good things will happen

We are optimist and realist. 我们是乐观主义者，又是现实主义者。
Peter, ever the optimist, said things were bound to improve. 一向乐观的皮特说，事情必定是会好转的。