Understanding a challenging task makes you feel good and develops your brain.

理解一项具有挑战性的任务会让你感觉良好，也会开发你的大脑。

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Architects have a challenging task.

架构师面对一个艰难的任务。

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Establishing an enterprise architecture repository is a challenging task.

建立企业架构存储库是一项非常具有挑战性的任务。

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Selling an uncertain and potentially unwelcome outcome such as this to the public would be a challenging task.

WSJ: Jeffrey S. Flier: Health 'Reform' Gets a Failing Grade

Finding and recruiting great digital marketing data scientists is a challenging task.

FORBES: Big Data: Using Experts to Decipher Digital Marketing Intelligence (Part 2 of 2)

"The Army is seeking to modernise and define its direction in the future, " said Col Law - although he admitted this was a challenging task.

BBC: British army stages record-breaking virtual battle