line of command

例句：

1. 1. The soldiers lined up in perfect formation to receive their orders.
   士兵们整齐地列队接受命令。
2. 2. The captain gave the line of command to his lieutenant.
   队长将指挥权交给了他的副官。
3. 3. The general ordered his troops to take up a defensive position along the line of command.
   将军下令他的部队沿着指挥线采取防御位置。