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