At his national-security briefing in the morning, Obama was instructed in the use of the nuclear codes, should he ever have to launch a strike.是什么意思_At his national-security briefing in the morning, Obama was instructed in the use of the nuclear codes, should he ever have to launch a strike.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句