求翻译：“21世纪大挑战”具有五个特点：第一，“21世纪大挑战”计划涉及的领域对健康、能源、可持续发展、教育、经济、国家安全以及人类探索等都具有很大影响。第二，“21世纪大挑战”计划的目标是宏伟的，但也是可以实现的。第三，“21世纪大挑战”计划是极具竞争力的，在本质上也是极具吸引力的，应该能够激发民众发挥想象力的。第四，“21世纪大挑战”计划是有限度的。大挑战应该有着可以测评计划成功与否的标准，以及计划最终完成的具体时间表。第五，“21世纪大挑战”计划有助于推动科技领域的创新以及创新成果在应用领域的推广。是什么意思？

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“The 21st century big challenges” has five characteristics: First, “the 21st century big challenges” the plan involves the domain to the health, the energy, the sustainable development, the education, the economy, the national security as well as the human exploration and so on all has the very trem

"21st century challenge" has five characteristics: first, the "21st century challenge" plans in the areas of health, energy, sustainable development, education, the economy, national security, and human exploration will have great influence. Second, the "21st century challenge" plan is ambitious, bu

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