例句：

　　How optimistic would you be?

　　你會(huì )如何樂(lè )觀(guān)？

　　Are you optimistic about the future?

　　你對未來(lái)樂(lè )觀(guān)嗎？

　　I think that we have reason to be optimistic.

　　我認為我們有樂(lè )觀(guān)的理由。

　　The pessimism may be overdone.

　　這種悲觀(guān)主義也許過(guò)了頭。

　　What is pessimism after all?

　　到底什么是悲觀(guān)情緒呢？

　　What's driving this new pessimism?

　　是什么駕馭著(zhù)這些新悲觀(guān)主義？