这是一个闭幕词。会议结束时，主持人往往对会议作个小结，最后宣布会议结束。（to declare the conference closed） Ladies and Gentlemen, Our seminar had lasted four days. It has achieved tremendous success. More than 20 professors and scholars spoke at the conference. Many more aired their views freely at group discussions, which proceeded in a friendly and lively atmosphere. We all benefited greatly by attending this conference. Science and technology are a kind of wealth created in common by mankind. They must in turn serve the needs of all the people and work for the interest of world peace. Any nation or country must learn from the strong points of other nations of countries, from their advanced science and technology. Let's join hands and explore the boundless universe in quest of the never-ending truth of science. Ladies and Gentlemen, you have my best wishes for your still greater achievements in your career of science. Now, I declare the conference closed. Thank you
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