flag control

例句：

1. 1. The flag is flown at half mast during the nationalanthem.
   国旗在国歌奏响时降半旗。
2. 2. The flagwas carefully controlled by themilitary officials.
   军人们小心翼翼地控制着旗帜。
3. 3. The flag control system ensures thatflags are displayed in a proper manner.
   旗帜控制系统确保旗帜以正确的方式展示。