According to the UNESCO Convention on Stolen and Illegally Exported cultural Objects, any cultural relics looted or lost during wars should be returned without any limitation of time span.

据联合国教科文组织公约，非法出口，被盗，被洗劫的文物，或者战争期间丢失的文物，应该不受任何限制的时间限制将其返还原国。

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Under the United Nations Educational, Scientific and Cultural Organization (UNESCO) convention of 1970, countries agreed measures to prevent the illegal export of national treasures.

根据联合国教科文组织1970年的协定，各国应该按照章程防止国家财产的非法出口。

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This week UNESCO held its annual World Heritage convention in Istanbul.

本周联合国教科文组织（UNESCO）在伊斯坦布尔召开世界遗产公约年会。

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The UNESCO Convention for the Safeguarding of the Intangible Cultural Heritage, 2003 provides an excellent framework in this regard.

UNESCO: Intangible culture focus of Fourth International Folklore Congress in Kathmandu | United Nations Educational, Scientific and Cultural Organization

The 20-year-old cultural property act gives U.S. officials the power to strike such agreements with nations that ratified the 1970 Unesco convention.

FORBES: Magazine Article

The UNESCO Convention recommends safeguarding the intangible heritage represented by traditions and oral expressions, rituals and festive events, traditional craftsmanship, music, dances and traditional performing arts.

UNESCO: MEDIA SERVICES