陈伟(音译)是人民大学人口与发展研究所的一位专家，他预计，至2040年，将有4亿年龄超过65岁的人口——总人口比例的四分之一。
There will be 400 million people over 65 by 2040 - a quarter of the population - estimates Chen Wei, an expert at Renmin University's population and Development Research Institute.
分折了当前人机系统研究所面临的问题及发展趋势。
Problems and development tendencies of the man-machine systems study are analysed.
分析了目前遥感蒸散研究所面临的问题和发展趋势。
Finally, the problems faced in the research of the land surface evapotranspiration based on the remote sensing technology and its future development trends were analyzed.
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