美国白宫：特朗普签署行政命令，将关税截止日期延长至8月1日。

Group 1 - The core point of the article is that President Trump has signed an executive order extending the deadline for tariffs to August 1 [1] Group 2 - The extension of the tariff deadline may impact trade relations and economic conditions [1] - This decision could influence various industries that are reliant on imports and exports [1]