1. With the (rapid, marked, amazing, eye-catching, remarkable, fantastic) development/ progress/ growth/ advance/ improvement of economy/ society/ industry/ living standard, great changes have taken place in...

　　随着经济、社会、工业、生活水平(快速、显著、惊人、令人瞩目的)发展、进步、增长、提高……发生了巨大的变化

　　2. At the turn of the century

　　(在)世纪初、世纪末、世纪之交

　　3. Thanks to China’s reform and opening-up policy...... has witnessed great economic and social progress in the past two decades.

　　多亏中国的改革开放政策……在过去20年里目睹了巨大的社会经济进步。

　　4. At present, currently, lately, recently, nowadays, these years, in the past several decades, over the last several years

　　目前、当前、近来、现今、这些年来、过去几年来

　　5. At the mercy of the ever-acelerated updating of science and technology, there are rapid changes in all aspects of our everyday lives.

　　受益于迅猛发展的现代科学技术，我们日常生活的方方面面都发生了巨大变化

　　6. With the arrival/ advent of the invention of .../ the information age/ the 21st century/ the economy age

　　随着……的发明、信息时代、经济时代的到来

　　7. With the increasingly more rapid economic globalization and urbanization, more problems are brought to our attention.

　　随着日益迅速的经济全球化和城市化，更多的问题受到我们的关注。

　　8. The human race has entered a completely new stage in its history. We have just crossed the threshold of the 21st century and the curtain of the new millennium is slowly rising.

　　人类已进入了历史上的一个全新阶段。我们刚刚跨入21世纪的门槛，新千年的帷幕正在徐徐升起。

　　9. We are blessed with new opportunities and faced with new challenges.

　　我们被赋予新的机会，并且面临着新的挑战。

　　10. We are now entering a brandnewera. The 21st century is a time of advanced scientific and technological knowledge.

　　我们正在静如一个崭新的时代，21世纪是最先进科技知识的时代