straight leg through vault

例句：

1. 1. The hikerswere so focused on the trail that they didn't notice the straight leg through the arch.
   登山者全神贯注于小径，没有注意到直行通过拱门。
2. 2. The construction workers had to make a straight leg through the arch to reach the other side of the building.
   建筑工人不得不直行通过拱门才能到达建筑物的另一侧。
3. 3. The old bridge was in such disrepair that it was almost impossible to get a car through the arch without hitting something.
   这座老桥损坏严重，以至于汽车几乎不可能直行通过拱门而不撞到东西。