After entering 21 century, Environmental Protection and sustainable development are becoming more concerned by the worldwide countries regarding the economic development.
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After entering 21~(st) century, all nations in the world are confronted with world-wide competition which is guided by education and based on technology.
世界各国在进入二十一世纪时，面临着全球化的竞争，而这种竞争是以教育为先导，科技为实力的竞争。
As the main means of personal communication, the wireless mobile communication technology is developed very fast after entering the 21-century.
进入二十一世纪后，无线移动通信技术作为个人通信的主要手段得到了迅猛发展。
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