sloping upwards opposite downhill上坡的 - uphill battle, struggle, task, etc.
an argument or a struggle that is difficult to win and takes a lot of effort over a long period of time 漫长而艰难的,费力的(战斗、斗争、任务等) He faces an uphill struggle to be fit in time for the championships. 他面临着一场艰苦的斗争,以便及时康复参加锦标赛。 The airline faces an uphill climb to compete with top air carriers. 这家航空公司面临着与顶级航空公司竞争的艰巨任务。