I challenge him to a duel.

我向他挑战进行决斗。

youdao

I challenge you to define your value.

我向你发出挑战：衡量自己的价值。

youdao

I challenge anyone here to race with me.

我向在此的每一个人挑战。

youdao

"I've always loved working with the robots. And when I first started it was a challenge working with the robots, understanding how they worked and figuring them out.

VOA: special.2010.07.28

So let me challenge you with this: inside of these curly braces where I have put a comment with slash slash -- a "comment" means nothing here gets compiled, it's just for the human to read.

让我用这个来挑战你们：,在这些花括号里面，我通过双斜杠写入了一个注释,-一条“注释“在这里不会被编译,它只是用来我们阅读的。

哈佛公开课 - 计算机科学课程节选

So I think that it's true that the economy is difficult and there is big challenge in front of us.

所以我觉得，目前的经济形势真的很困难，我们面临着很大的挑战。

事业就是挑战 - SpeakingMax英语口语达人

"I'll take on that challenge, I love that challenge, I want that challenge, " he said.

WSJ: Anthony scores 37, Knicks clinch playoff berth

And as far as marketability is concerned, I challenge that the wisdom that wrestling cannot be good theater.

FORBES: Commercialism Pins Common Sense as IOC Ousts Wrestling from 2020 Summer Olympics

In The Happiness Advantage, I challenge readers to do one brief positive exercise every day for 21 days.

CNN: Is happiness the secret of success?