Remarks by Ma Zhaoxu at Vision China Program
讲话致辞
讲话致辞
讲话致辞
双语：古特雷斯秘书长2020年保护臭氧层国际日致辞
Message by UN Chief on the International Day for the Preservation of the Ozone Layer 2020
讲话致辞
讲话致辞