Feeding today's population is a challenge for an already-stressed environment.

养活今天的人口对已经很紧张的环境来说是一个挑战。

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Like most students, when studying at middle school, I found math interesting but difficult, which was a challenge for me.

像大多数学生一样，读中学时，我觉得数学虽有趣但很难，这对我来说是一个挑战。

youdao

In a challenge for manufacturers, 81% of paper product users said they would consider buying recycled toilet tissue if it were comparable in quality to standard paper.

制造商面临的一个挑战是，81%的纸制品用户表示，当回收再造的卫生纸质量与标准卫生纸相当时，他们才会考虑购买。

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While this past year has been a challenge for the opposition Green Movement, senior scholar Gary Sick of Columbia University says that in the aftermath of the election, the Iranian government also faces a huge challenge.

VOA: standard.2010.06.11

Let's see if we can do that, and it's a little bit of a challenge for the performer.

让我们看看能不能做到这个,对于表演者来说,还真是个挑战呢

耶鲁公开课 - 聆听音乐课程节选

And it was a challenge for a while, but I enjoy learning different languages.

当时那还真是个挑战，但我喜欢学习不同的语言。

第二外语，英语 - SpeakingMax英语口语达人

ANNpower is a challenge for women to make their own first ripple within the world.

FORBES: What Is ANNpower?

Taking a short position in junk bonds is a challenge for the retail investor.

FORBES: Doomsday Investing

This has posed a challenge for scientists trying to figure out where dark matter is.

FORBES: Mapping The Universe Through Collective Brainpower