例句：

　　How optimistic would you be?

　　你會(huì)如何樂觀？

　　Are you optimistic about the future?

　　你對未來樂觀嗎？

　　I think that we have reason to be optimistic.

　　我認(rèn)為我們有樂觀的理由。

　　The pessimism may be overdone.

　　這種悲觀主義也許過了頭。

　　What is pessimism after all?

　　到底什么是悲觀情緒呢？

　　What's driving this new pessimism?

　　是什么駕馭著這些新悲觀主義？