optimistic/optimism/optimist/pessimistic/pessimism/pessimist
记忆：
1. optimistic [ 7Cpti5mistik] opt 表示“优”， adj. 乐观的 We hold an optimistic opinion about the human future. 我们对人类未来持乐观态度。
2. optimism [ 5CptimizEm] n. 乐观, 乐观主义 During the Long March, it’s the revolutionary optimism that encouraged them. 在长征中，是革命乐观主义鼓励着他们。
3. optimist [`CptImIst] n. 乐天派, 乐观者 The smiling face suggested he was an optimist. 那张笑脸表明他是个乐天派。
4. pessimistic [ 7pesi5mistik] adj. 悲观的 What a pity that they take a pessimistic view of life. 他们对生活很悲观，这真遗憾！
5. pessimism [ 5pesimizm] n. 悲观, 悲观主义 We should drive pessimism away from our mind. 我们应该把悲观主义赶走。
6. pessimist [5pesImIst] n. 悲观论者, 悲观主义者 Stay away from those pessimists, or you may become pessimistic too. 不要接近那些悲观主义者，否则你也会变得悲观的。
另类阅读：
The old tend to be pessimists. They are often pessimistic about the future. But some of them enjoy optimism, too. On the other hand, the young tend to be optimists. They are often optimistic about the future, but some of them also bear pessimism.