1.The result is not set in stone, and there is hope for this team.

结果尚未确定，这个球队还有希望。

These are just a few ideas about this project. Nothing is set in stone yet.

这还只是关于这个项目的一些想法。什么都还没定下来。

set in stone:

(idiomatic) permanent; certain; firm

Synonyms:

written in stone

carved in stone

2.The whole future of the project is still up in the air.

这个项目前途未卜。

up in the air:

(idiomatic) Not yet resolved, finished, answered, decided or certain.

3.After two hours spent wandering in the snow, I realized we were on a wild goose chase.

在雪地里转悠了两个小时后，我意识到我们只是在白费力气。

wild-goose chase:

(figuratively) A futile search, a fruitless errand; a useless and often lengthy pursuit.