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- Bill Gates는 세상이 20년 안에 더 좋아질 것이라고 말한다: ‘제 낙관론은 흔들리지 않습니다’ Power Players Bill Gates says the world will be better in 20 years: ‘My optimism hasn’t been shaken’
- 454.헬렌 켈러(Helen Keller)의 명언(영문 직역) (9) Optimism is the faith that leads to achievement. Nothing can be done without hope and confidence. Walking with a friend in the dark is better than walking alone in the light.