stope board

例句：

1. 1. The stope board is used to mark the boundaries of the working area.
   矿脉板用于标记工作区的边界。
2. 2.The miners were using the stope board to guide their movements.
   矿工们正在使用矿脉板来指导他们的行动。
3. 3.The stope board was made from wood and had a thickness of about 1 inch.
   矿脉板由木头制成，厚度约为1英寸。