玛息阿觉得他长笛吹得比阿波罗好，便向这位神发出挑战。

Marsyas thought he could play the flute better than Apollo and challenged the god to a contest.

《柯林斯英汉双解大词典》

2012年，Kaggle向其社区发起挑战，要求建立一个可以给高中论文打分的程序。

In 2012, Kaggle challenged its community to build a program that could grade high-school essays.

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国家植树节基金会向许多城市发起挑战，要求它们通过种植和保护更多的树木来赢得那面“美国树城”的旗帜。

The National Arbor Day Foundation has challenged many cities to earn its "Tree City USA" flag by planting and protecting more trees.

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Also, shows you something about the challenge of it, because we are susceptible to attack from lots of different kinds of microorganisms.

同样也向你们展示这其中的一些挑战,因为我们也容易受到,各类微生物感染的危害

耶鲁公开课 - 生物医学工程探索课程节选

I've tried to suggest through these stories and these arguments some sense of the risks and temptations, of the perils and the possibilities.

以上我是想向大家说明，这些故事和争论,展示的风险与诱惑，挑战与机遇。

耶鲁公开课 - 公正课程节选

We're going to really get into this next class, but I just want to introduce it to you to give us a start, and many of you have used Lewis structures in high school, but we'll be doing some much more challenging Lewis structures, I can assure you, in this class here.

其实我们下节课才会详细介绍它，但是今天我只想以简单介绍作为开始，大部分同学在高中就用过路易斯结构了，但是我们会遇到一些更具挑战性的,路易斯结构，我可以向大家保证，在这门课中会的。

麻省理工公开课 - 化学原理课程节选