中美谈了很久没谈妥，美国致电北京，特朗普憋不住了，提出最后期限

Group 1 - The core focus of the recent video call between Chinese Vice Premier and U.S. Trade Representative was on bilateral economic and trade issues, emphasizing the importance of honest dialogue to enhance mutual understanding and resolve existing problems [1][4] - China expressed serious concerns regarding the U.S. tariffs imposed under the pretext of fentanyl and the ongoing 301 investigation, urging the U.S. to return to negotiations based on equality [1][3] - The U.S. has not committed to canceling the tariffs but acknowledged the significance of continued communication to address mutual concerns [4][6] Group 2 - The U.S. Department of Commerce recently added over 50 Chinese companies and research institutions to its "entity list," citing national security threats related to advancements in AI and quantum computing [6] - President Trump announced a 25% tariff on all imported cars, effective April 2, stating that this measure would be permanent and would not apply to cars manufactured in the U.S. [6] - The concept of "reciprocal tariffs" is being promoted by the Trump administration, which could escalate the trade conflict between the U.S. and China, potentially leading to a countdown in the trade war [8]