特朗普将钢铝关税提高至50%的命令生效，英国得以豁免上调。

Group 1 - The core point of the article is that President Trump has increased tariffs on steel and aluminum to 50%, while the UK has been granted an exemption from this increase [1] Group 2 - The increase in tariffs is part of a broader trade policy aimed at protecting domestic industries [1] - The exemption for the UK may influence trade relations and negotiations between the US and other countries [1]