I like challenging and creative jobs .

我喜欢具有挑战性和创造性的工作。

What is the most challenging portrait ?

哪个是最具挑战性的肖像画？

Distribution in the us was more challenging .

在美国发行报纸更具挑战性。

Cracking that may be more challenging .

突破这一领域可能更具挑战性。

Addressing local concerns can be especially challenging .

表达当地居民的诉求尤其具有挑战性。

Accomplishing these three steps will be challenging .

完成这三步具有一定的挑战性。

But open air feasts can be challenging .

但露天盛宴往往也充满了挑战性。

Thesis preparation is a challenging writing task .

论文写作是一个有挑战性的任务。

Photographing children is a very challenging task .

给孩子拍照是一项极具挑战性的任务。

Quitting can therefore be quite challenging .

因此，断瘾可是相当具有挑战性的。