I opened the convention with a keynote address designed to make the case that America needed to change course and that the DLC could and should lead the way.是什么意思_I opened the convention with a keynote address designed to make the case that America needed to change course and that the DLC could and should lead the way.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句