Reducing the environmental impacts of aquaculture is a significant task.

减少水产养殖业对环境的影响是一项重要的任务。

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The most significant task a navigation menu has to accomplish is to unambiguously guide visitors through different sections of a website .

导航所要完成的最大任务，是清晰地引导用户到达网站的不同地方。

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Actually, the reason we need and put our hope in photography is that it could and should bring a creative viewing, and the most significant task of photography is to refresh our exhausted eyes.

实际上，我们之所以需要并寄希望于摄影，是因为摄影能够并应该带来一种创造性的观看，摄影的最重要的任务就是让我们日渐疲乏的双眼再次振奋起来。

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They found that patients showed significant improvement in the delayed verbal recall task, in which participants were asked to remember what they had been told earlier.

CNN: Nutritional drink, imaging show promise for Alzheimer's

The new federal plan, developed by the departments of Justice and Homeland Security, calls for doubling the number of border security task force teams and moving a significant number of other federal agents, equipment and resources to the border.

CNN: Obama to beef up Mexico border policy

It will be an extremely difficult task exacerbated by the current economic crisis and our need for significant tax cuts to spur growth.

WSJ: Rick Perry: My Tax and Spending Reform Plan