1.经济的快速发展 the rapid development of economy
2.人民生活水平的显著提高/ 稳步增长theremarkable improvement/ steady growth of people’sliving standard
3.先进的科学技术 advanced science and technology
4.(be) aware of (=be conscious of , having knowledge or consciousness)意识到,知道。
5.at the back of (=behind) 在…后面
6.in the back of 在…后部(里面); on the back of 在…后部(外面); be on one's back(=be ill in bed) 卧病不起。