美国“命门”被中国拿捏后，特朗普急了，下令要封锁中国航空技术

Group 1 - The trade war initiated by the Trump administration against China led to immediate retaliatory measures from China, including the implementation of a "rare earth ban," positioning China advantageously in the ongoing negotiations with the U.S. [1] - Following the announcement of high tariffs on Chinese goods, China quickly responded with a series of countermeasures, including imposing tariffs on U.S. imports and restricting the export of seven heavy rare earth elements [1] - Rare earth elements play a crucial role in modern technology, particularly in the manufacturing of high-performance magnets, which are essential for military aviation, missile technology, drones, and electric vehicles [1] Group 2 - Although rare earth resources are not exclusive to China, the complexity and environmental challenges of extraction limit other countries' capabilities, resulting in China's near-monopoly in the global heavy rare earth processing sector [2] - The U.S. faces difficulties in finding alternative solutions due to the technical challenges of rare earth extraction and China's dominance, prompting the Trump administration to attempt to block Chinese aviation technology to pressure China into relaxing the "rare earth ban" [4] - The U.S. Department of Commerce has suspended licenses allowing American companies to sell products and technology to China's Commercial Aircraft Corporation, aiming to weaken China's capabilities in developing the C919 passenger aircraft [4] Group 3 - Despite the C919 being entirely developed and manufactured in China, it still relies on imported engines and key components from the U.S. and Europe, which is a significant reason for the Trump administration's policy restrictions [5] - The procurement of components from the U.S. and Europe is primarily driven by economic efficiency, certification needs, and the desire to learn advanced practices, rather than a lack of technical capability in China [5]