郭嘉昆美方发动的关税战违反了世贸组织规则，损害了各国共同利益，也危害了以联合国为核心的国际体系和以联合国宪章为基础的国际秩序。联合国各机构有权利也有责任就美方滥施关税发出自己的声音。

Guo Jiakun The tariff war started by the U.S. violates the WTO rules, harms the common interests of all countries, and endangers the international system with the UN as its core and the international order based on the UN Charter. UN agencies have the right and responsibility to speak up on U.S. tariffs.