That is why the 15-member United Nations Group of Governmental Experts on Transparency and Confidence-Building Measures in Outer Space Activities have examined numerous proposals and changes in political and technological environment since 1993.

因此，外层空间活动透明度和建立信任措施的15名联合国政府专家小组成员已经审查了1993年以来诸多有关政治和科技环境的提议和更动。