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

結果尚未確定，這個球隊還有希望。

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

這還只是關于這個項目的一些想法。什么都還沒定下來。

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.

這個項目前途未卜。

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.

在雪地里轉悠了兩個小時后，我意識到我們只是在白費力氣。

wild-goose chase:

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