Thus, it is an important and challenging task to improve the quality of multimedia transmission service.

如何提高多媒体传输的质量是一个重要而有挑战性的任务。

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The preparation of stereospecific compounds is an important and challenging area of contemporary synthetic organic chemistry.

立体选择性化合物的制备是当代有机合成化学中非常重要而且具有挑战性的领域之一。

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Therefore, it is very important and challenging to search for signals of new physics at forthcoming high energy collider experiments.

因此在将来的高能对撞机实验中寻找新物理的信号既非常重要也是一个挑战。

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Many people who've been through presidential transitions in the past say the combination of two wars abroad, an economic crisis at home and unparalleled security threats make this one of the most challenging and important transition periods in modern history.

NPR: Obama's Transition Team Gets To Work In D.C.

That is why the UK National Commission for UNESCO (UKNC) supports developing country professionals working in this challenging and increasingly important field.

UNESCO: Science Communication

All those things are going to be important, and all those things are going to be challenging.

WHITEHOUSE: President Obama��s News Conference on the American Jobs Act