unclosed traverse

例句：

1. 1. The unclosed traverse of the tunnel is a challenge to navigate.
   隧道未封闭的穿越是一个导航上的挑战。
2. 2. The team's unclosed traverse was a test of their skills and endurance.
   团队的未封闭穿越是对他们技能和耐力的考验。
3. 3. The unclosed traverse of the mountain trail was treacherous, requiring careful navigation.
   山间小径的未封闭穿越非常危险，需要小心导航。