The problem is becoming more challenging because we're sending more objects into space to help people use their mobile phones and computer.

这个问题正变得越来越具有挑战性，因为我们正在向太空发射更多的物体来帮助人们使用他们的手机和电脑。

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If they don't get enough sleep at night, they will face more challenging situations in schoolwork.

如果他们晚上没有充足的睡眠，他们将在学业上面临更多挑战。

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Students who take more challenging classes and spend more time studying do learn more.

参加更具挑战性的课程和花更多时间学习的学生确实会学到更多。

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He says he likes that the music is more challenging than what he plays with his school orchestra.

VOA: special.2010.06.21

We're still close enough to the summer that the air is not just filling us up with extra static electricity, so it's a little more challenging here.

我们现在离夏天更近了,这样空气中不总是,充满额外的静电，所以这时做实验,会有一些挑战性。

麻省理工公开课 - 化学原理课程节选

I think this is as good list so let's go and think about what might be a little bit more challenging.

我想上面这些都是很好的例子,接下来我们思考一些更有挑战的问题

耶鲁公开课 - 生物医学工程探索课程节选

Two market events currently underway are making the search for income via investments more challenging.

FORBES: Why bubbles are scary.

Obtaining affordable health insurance is even more challenging for millions of Americans older than 50.

FORBES: Magazine Article

The more challenging or severe a situation, the more difficult it is to address.

FORBES: How To Be A Values-Based Leader In Times Of Trial