The US Titan-4 rocket, however, suffered three successive failures on August 2, 1998, and on April 9 and 30, 1999.是什么意思_The US Titan-4 rocket, however, suffered three successive failures on August 2, 1998, and on April 9 and 30, 1999.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句