路上的大石头成了我们前进的障碍。
The large rock on the road became an ___obstruction to our progress.
路上有几棵树倒下来，形成了通行的障碍。
Several fallen trees on the road created ___obstructions to traffic.
施工队的卡车造成了道路堵塞。
The construction trucks caused an ___obstruction on the road.
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