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国际隧协(ITA)第二十届年会及与埃及国家隧道局联合召开的以“隧道工程与地面环境”为主题的国际学术讨论会于1994年4月2～6日在埃及首都开罗举行。协会41个会员国中,有28个国家(南非联邦、阿尔及利亚、德国、奥地利、比利时、加拿大、韩国、丹麦、埃及、西班牙、美国、芬兰、法国、匈牙利、意大利、日本、莱索托、摩洛哥、墨西哥、挪威、荷兰、罗马尼亚、英国、斯洛伐克、瑞典、捷克、
International Symposium on “Tunnel Engineering and Ground Environment” jointly held by the twentieth annual meeting of the International Tunnel Association (ITA) and the Egyptian National Tunnel Agency was held in Cairo, Egypt from April 2-6, 1994 . Of the 41 Member States of the Association, 28 (Federated States of South Africa, Algeria, Germany, Austria, Belgium, Canada, South Korea, Denmark, Egypt, Spain, United States, Finland, France, Hungary, Italy, Japan, Lesotho, Morocco, Mexico , Norway, Netherlands, Romania, United Kingdom, Slovakia, Sweden, Czech Republic,