He left a note at the scene of the crime, challenging detectives to catch him.

On PC, the game had it all — imaginative storyline and characters, challenging gameplay, superb graphics.

个人电脑里的游戏非常完美，从想象力丰富的故事情节及人物到富有挑战性的游戏设计和精美画面，应有尽有。

Many enjoy the mental stimulation of a challenging job.

很多人喜欢富有挑战性的工作所带来的强烈的精神刺激。

Mona gave him a challenging look.

莫娜挑衅地看了他一眼。

a challenging and rewarding career as a teacher

富有挑战性且有意义的教师职业

We have changed the course to make it more challenging.

我们改了课程以使其更具挑战性.

The new play poses some challenging questions.

这出新戏提出了一些富有挑战性的问题.

The newspaper was directly challenging the government's legitimacy.

报纸直接质疑政府的合法性.

It's important this team is challenging and that we're right there at the end.

球队具有战斗力是很重要的,那就是我们最终站到一起的原因.

There's no doubt that these are challenging times.

毫无疑问,目前经济环境对我们挑战极大.

She performed the most challenging task without a mistake.

她毫无差错地完成了这一最富有挑战性的任务.

Let's yell out beautiful, practical and challenging sentences to crack your pronunciation.

让我们喊出漂亮, 实用有意义的句子来突破英语发音.

Thus, empirical modeling of housing market behavior is a challenging task.

因此, 建构住宅市场行为的实证模型是一项极具挑战性的工作.

The scaling problem is the most challenging.

结垢是最复杂的问题.

Few shots are as challenging as the low volley.

很少有一种击球比低位截击更具挑战性.

Although automatic text translators are now reasonably effective, voice recognition has proved more challenging.

尽管自动文本语言翻译目前相当有效, 语音识别还是十分具有挑战性的.

It is well known that operating a process under unstable conditions is a challenging control problem.

众所周知,将程序操作在不稳定点的条件上是很具挑战性的控制问题.

The law must have teeth, and it must be enforced.

法律必须拥有效力，而且必须强制实施。

He suddenly smiled, revealing teeth that had recently been capped.

他突然笑了出来，露出了刚箍过的牙。

The bear exposed its teeth in a muffled growl.

那只熊龇出牙齿，发出一声低沉的吼叫。

I can't understand why folks complain about false teeth.

我就不明白，人们为什么老是抱怨假牙的问题。