an uphill battle 一场艰苦的战斗；艰难的战斗；在逆境中求胜

【例句】
Winning the case is an uphill battle.
要打赢这场官司很艰苦。

It's an uphill battle but I think we're going to win.
虽然这是一场艰苦的斗争，但我相信我们会取得胜利。