challenge

挑战、难题、考验

Learning a new language as an adult is a real challenge.

成年后学一种新语言是不小的挑战。

质疑、异议

His theory has faced serious challenges from other researchers.

他的理论受到其他研究者强烈的质疑。

挑战、邀战

She accepted his challenge to a rematch next week.

她接受了他下周再比一场的挑战。

质疑、对…提出异议

Several members challenged the accuracy of the report.

好几位成员质疑那份报告的准确性。

向…挑战、挑战

The young player challenged the champion to a match.

那位年轻选手向冠军下了比赛的挑战书。

考验、激发

I want a job that really challenges me.

我想找一份真正能激发我能力的工作。

争夺、力争

Two teams are challenging for the top spot this season.

本季有两支球队在争夺头名。