可以引申为“艰难的、费力的”。当我们说一项任务非常艰难的时候，除了使用 difficult, hard, tough, demanding 等之外，还可以使用 uphill 来替换，让表达更加贴切、形象。
例句
1、Whenever the Chinese national football team plays a European team, it is going to be an uphill battle.
2、Alibaba has been widely regarded as an e-commerce giant. Although it seemed like an uphill task for Pinduoduo to stand out, it dealt tactfully with the hard realities and went public merely three years after its launch.
反义词 down hill
当我们想表达某某事情易如反掌的时候，就可以用它，一般的习惯表达是：be all downhill (from here) 或者 be downhill all the way (from here)。比如： We have got the toughest part done, and it will be downhill all the way from here.
翻译
Only within 2 month ，it’s an uphill task from IELTS score of 6 to score of 8 to everyone.
造句
It’s an uphill task to decrease my heart rate for me in Long distance running.
