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 (一定要有冠词，字母 I 大写)
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
