stand-by column

例句：

1. 1. Thesoldiers were standing by to assist the injured.
   士兵们随时准备帮助受伤的士兵。
2. 2. The companyhas a stand-by column of100 men.
   该公司有一支100人的待命部队。
3. 3. The firefighters stood by to put out theflames.
   消防员随时准备扑灭火焰。