single file
剑桥词典
- a way of walking with one person behind another
单行，一路纵队
The schoolchildren were told to walk in single file . 小学生们被要求排成一路纵队前进。 返回 single file
单行，一路纵队
The schoolchildren were told to walk in single file . 小学生们被要求排成一路纵队前进。 返回 single file