rope mark

例句：

1. 1.The policeman used a rope mark to guide the searchers through the dense forest.
   警察用绳索标记来引导搜救人员穿过茂密的森林。
2. 2. The scientist marked the sample with a rope mark before analyzing it.
   科学家在分析样本之前用绳索标记了它。
3. 3.The engineer used a rope mark to indicate the location of the new bridge.
   工程师用绳索标记来指示新桥梁的位置。