日本财务省官员：贸易、不确定性是G20公报的关键词。

Group 1 - The core message of the article emphasizes that trade and uncertainty are the key themes highlighted in the G20 communiqué [1] Group 2 - Japanese Ministry of Finance officials indicate that the discussions at G20 are heavily focused on the implications of trade dynamics and the prevailing uncertainties in the global economy [1]