例句：
How optimistic would you be?
你會如何樂觀？
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？