cross-buck sign

例句：

1. 1. The policeman used a cross-buck sign to warn pedestrians to stay off the road.
   警察使用一个十字交叉标志来警告行人不要走上路。
2. 2.The farmer noticed the cross-buck sign and knew it was time to start harvesting.
   农民注意到了十字交叉标志，知道是时候开始收割了。
3. 3.The engineer drew a cross-buck sign on the map to indicate the location of the mine.
   工程师在地图上画了一个十字交叉标志，以指示矿井的位置。