41.不可推卸的义务 unshakable duty
42. 满足需求 satisfy/meet the needs of…
43．可靠的信息源 a reliable source of information
44．宝贵的自然资源 valuable natural resources
45．因特网 the Internet （一定要由冠词，字母I 大写）
46．方便快捷 convenient and efficient
46．方便快捷 convenient and efficient
47．在人类生活的方方面面 in all aspects of human life
48．环保（的） environmental protection/environmentally friendly
49．社会进步的体现 a symbol of society progress
50．科技的飞速更新 the ever-accelerated updating of science and technology
