Its a challenge.

它的挑战。

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Its a challenge of your ability to learn a new language.

它的你的能力的挑战学习一种新的语言。

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When we are looking at the life of a tree, we learn about that each period of life brings its own form of joy and challenge.

当我们观察一棵树的生命时，我们了解到生命的每一个阶段都有它自己的欢乐和挑战。

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"A normal baby could respond to that challenge, lift its head up, turn its head and arouse or wake up,"

VOA: standard.2010.02.08

His remarks came a week after a federal appeals court said Aereo could continue its service despite a legal challenge by broadcasters.

WSJ: Exec threatens to pull Fox signal if Aereo goes on

In November, DARPA put street-level robots to the test in its Urban Challenge, a race of 12 autonomous cars through simulated city streets populated by obstacle cars.

FORBES: War Without Soldiers

The Company is providing open access to this data as part of its PacX Challenge, a global competition seeking new ocean applications and research using the PacX data set.

ENGADGET: Liquid Robotics' Wave Glider breaks Guinness record, does it in the name of science