natural crossing block

例句：

1. 1. The researchers found that the natural crossing block was a significant factor in the success of their experiment.
   研究人员发现，自然交叉障碍物是实验成功的关键因素。
2. 2. The team successfully navigated through the natural crossing block and reached the other side safely.
   团队成功地穿越了自然交叉障碍物，安全到达了另一边。
3. 3. The construction of this bridge was designed to avoid any natural crossing blocks that might pose arisk to pedestrians.
   这座桥梁的建造旨在避免任何可能对行人构成危险的自然交叉障碍物。