The US suffered a setback in the race with China and Russia to develop hypersonic weapons when its latest test failed, the Pentagon said in a statement Thursday.
원문출처 : https://www.cnn.com/2021/10/21/politics/us-hypersonic-test-fails/index.html
원문출처 : https://www.cnn.com/2021/10/21/politics/us-hypersonic-test-fails/index.html