optimistic 用英语:

I am not sanguine that the negotiations will succeed.

With the prospect of having to learn 3,000 words during the course of the summer, Paul was anything but sanguine.

There is considerable optimism that the economy will improve.

The film also reveals that one does not have to be learned or clever to achieve fame and wealth and that optimism and cheerfulness are equally important in life.

However, optimism of the will is always the best way forward.

That proved to be no more than an expression of optimism when World War II began.

My father chose not to disturb my optimism.

Optimism is merely a lack of information.