名词
中文翻译：乐观主义
同义词：
['pessimism', 'optimist', 'cheerfulness']
例句：
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1. The team's performance was full of optimism and confidence.
团队的表现充满了乐观和自信。
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2. Optimism is a great motivator for success.
乐观是成功的强大动力。
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3. She always has a positive outlook on life, which is a source of optimism for her.
她总是对生活持积极态度，这对她来说是一股正能量。