optimism

optimism
noun
[mass noun]
  1. hopefulness and confidence about the future or the successful outcome of something
    乐观
    the talks had been amicable and there were grounds for optimism.
    会谈是友好的，有理由乐观。
  2. (Philosophy)the doctrine, especially as set forth by Leibniz, that this world is the best of all possible worlds
    (哲)乐观主义（尤指莱布尼兹提出的学说）
    ■the belief that good must ultimately prevail over evil in the universe
    乐观主义
派生
optimist
noun
语源
  1. mid 18th cent.: from French optimisme, from Latin optimum 'best thing' (see optimum)
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