But the brave regiment had bought a day for the British Expeditionary Force (BEF) to retreat inside its defensive lines outside Dunkirk.是什么意思_But the brave regiment had bought a day for the British Expeditionary Force (BEF) to retreat inside its defensive lines outside Dunkirk.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句