The content of TNT in seismic explosive columns is decreased 50% because of using expanded ammonium nitrate instead of common ammonium nitrate.是什么意思_The content of TNT in seismic explosive columns is decreased 50% because of using expanded ammonium nitrate instead of common ammonium nitrate.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句