I sometimes get worried in this job. Having said that, I enjoy doing it, it's a challenge.

我有时会为这份工作而感到忧虑。话虽如此，我还是蛮喜欢干的，因为这是一个挑战。

《牛津词典》

Part of the challenge is speed, too—how quickly you can get these answers in terms of getting them in on time.

部分挑战也来自于速度——你多快能做出答案，能否在规定的时间内做完。

youdao

Some complain about the teachers if their kids get hurt in schools; some even challenge the schools' teaching methods and management.

如果孩子在学校受伤，一些人就抱怨老师；有些甚至质疑学校的教学方法和管理。

youdao

Right now the biggest challenge many face is access to credit - the ability to get loans at affordable rates.

VOA: standard.2009.03.16

- Part of the challenge is speed, too, how quickly you can get these answers in terms of getting them in on time.

部分困难也会来自于速度，你多快能做出答案,能否在规定的时间做完。

麻省理工公开课 - 化学原理课程节选

The challenge will be to get legislation on the table that will back up those numbers.

面临的挑战将是进行支持这一目标的立法。

对全球变暖的政策 - SpeakingMax英语口语达人

That might be an excuse for us to get a challenge from somebody in a primary.

WHITEHOUSE: President Obama Holds a News Conference

She chose not work in a positive way to get this challenge addressed.

FORBES: Getting In Our Own Way- Victims and Bullies

And if the call is over-turned, the manager should get another challenge.

FORBES: WORST CALL EVER Should Finally Take Baseball Into 21st Century (Instant Replay)