US military says a BLACK HAWK helicopter went down northern Iraq, killing all 14 soldiers onboard. Officials say it was almost likely a mechanical problem and not an enemy attack.是什么意思_US military says a BLACK HAWK helicopter went down northern Iraq, killing all 14 soldiers onboard. Officials say it was almost likely a mechanical problem and not an enemy attack.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句