This is a win-win situation all around.

这是一个各得其所的局面。

It's a win-win situation for both of you.

不过，如果只是我帮助她，这好像并不是双赢的局面呦。

A win-win situation!

好一个双赢的局面！

It is a win-win situation for sellers and buyers.

这是一个买方和卖方双赢的局面。

But it does seem to provide a win-win-win situation.

不过这样似乎会提供一个三赢的局面。