【英文】
The most fundamental principle of multilateralism is to address international issues through consultation in accordance with the collectively agreed rules, with each country's interests and concerns taken into consideration.
【译文】
多边主义最基本的原则是要按照大家都同意的规矩，磋商解决国际间事务，要兼顾各国利益和关切。
【词汇】
consultation：咨询，磋商，开会讨论。
accordance：按照、依据。
collectively：集体地，共同地。
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