1. An optimist sees an opportunity in every calamity; a pessimist sees a calamity in every opportunity. 乐观者在每次灾难中看到一个机会，悲观者在每次机遇里看到一个灾难。
2. The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails. 悲观主义者抱怨有风；乐观主义者希望风向改变；现实主义者调整船帆。
3. Both optimists and pessimists contribute to our society. The optimist invents the airplane and the pessimist the parachute. 乐观者和悲观者对社会都有贡献。乐观者发明飞机，悲观者发明降落伞。
