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1.The Treaty of Paris was a cornerstone of the European Union.
《巴黎条约》是欧洲联盟的基石。
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2.The United Nations is an international organization that aims to promote peace and security.
联合国是一个旨在促进和平与安全的国际组织。
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3. China has been a member of the Organisation for Economic Co-operation and Development (OECD) since 1978.
自1978年以来，中国一直是经济合作与发展组织的成员国。