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To the Editor:With the start of the China-US trade war,the Trump administration signed the Fiscal Year 2019 Defense Authorization Act,restricting the use of 5G in the United States by companies such as Huawei.This is obviously contrary to global integration.5G network comprehensive performance is up to 100 times than 4G,with ultrahigh data rate,low delay,high mobility,high energy efficiency,and other characteristics.