single cut file

例句：

1. 1. Thecompany has a strict policy of keeping allemployees in single files during work hours.
   该公司有严格的政策，要求所有员工在工作时间内保持单列。
2. 2. In theold days, people usedto keep their documents in singlefiles for safekeeping.
   在过去，人们习惯于将文件保存在单列中以便于安全保管。
3. 3. The engineer carefully cut thewood into single files for further processing.
   工程师仔细地将木材切成单列以便进一步加工。