例句：
How optimistic would you be?
你会如何乐观？
Are you optimistic about the future?
你对未来乐观吗？
I think that we have reason to be optimistic.
我认为我们有乐观的理由。
The pessimism may be overdone.
这种悲观主义也许过了头。
What is pessimism after all?
到底什么是悲观情绪呢？
What's driving this new pessimism?
是什么驾驭着这些新悲观主义？