1. describe vt.叙述; 描写，形容
例句：We asked her to describe what kind of things she did in her spare time
我们请她描述一下她业余时间都在做什么。

2. optimism n. 乐观; 乐观主义
例句：This was not optimism, it was delusion.
这不是乐观，这是妄想。

3. optimistic adj.乐观的，乐观主义的
例句：Michael was in a jovial and optimistic mood.
迈克尔情绪愉快乐观。

4. increase vt.增加，增大，增多
例句：The population continues to increase
人口继续增长。

5. imagine vt.想像; 想，设想
例句：He could not imagine a more peaceful scene
他想象不出比这更祥和的景象。
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