chain-command flag

例句：

1. 1. The chain-command flag is used to indicate the start of a new task or project.
   链式命令标志用于指示新任务或项目的开始。
2. 2.The chain-command flag is often seen on military vehicles to indicate the location of the driver.
   链式命令标志通常在军事车辆上看到，以指示驾驶员的位置。
3. 3.The chain-command flag is a crucial tool for ensuring safety and efficiency in any workplace.
   链式命令标志是确保任何工作场所安全和效率的关键工具。