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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 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 | 
