in single file moving in a line, with one person behind another一路纵队地，排成单行:•We walked in single file across the bridge.我们排成一路纵队过桥。—single file adv.in single file成单行;成一路纵队：A military band marched in single file in the street，pedestrians all stopped and listened to them.一队军乐队在大街上成一路纵队行进，行人们都停下脚步听他们演奏。 |