标记牌

例句：

1. 1. Thepoliceman placed a red flag on theroad to mark the accident area.
   警察在路边放置了一面红旗，以标示事故现场。
2. 2. Thestore displayed its logo on everycorner of the building as a wayto mark its presence.
   商店在大楼的每个角落都展示了其标志，作为展示其存在的方式。
3. 3. The new signposts were installed to help drivers navigate throughthe busy intersection.
   新安装的指示牌是为了帮助司机在繁忙的十字路口导航。