optimistic

He is optimistic about his chance of winning a gold medal in the Olympics next year.

他对在明年奥运会上获得一枚金牌的可能性表示乐观。

She is very optimistic.

她非常乐观。

I'm optimistic about the future.

我对未来很乐观。

Stay optimistic!

保持乐观！

He has an optimistic attitude.

他有乐观的态度。