特朗普发出威胁，巴西总统称将对美发起反击，中方送上两颗定心丸

Group 1 - The core viewpoint of the news is that Trump has threatened multiple countries with high tariffs, particularly targeting Brazil with a proposed 50% tariff, which could severely impact Brazilian exports to the U.S. [1][3][5] - Brazil's President Lula has publicly opposed Trump's tariff threats, indicating that Brazil will retaliate if the U.S. imposes the tariffs, signaling a potential trade conflict [5][9] - The U.S. plans to impose a 25% tariff on products from Brunei and Moldova, and a 30% tariff on products from Algeria and Libya, highlighting a broader strategy of trade intimidation [3][5] Group 2 - China has expressed support for Brazil's stance against U.S. trade aggression, with recent actions including the potential lifting of import restrictions on Brazilian chicken products [5][7] - Brazil and China have signed a memorandum to initiate the "Two Oceans Railway" project, which could strengthen economic ties and provide Brazil with alternative trade routes [7][9] - The news suggests that the era of U.S. hegemony is waning, as countries like Brazil are increasingly aligning with China and resisting U.S. pressure [9]