obstacle
noun [ C ] uk/ˈɒb.stə.kəl/ us/ˈɑːb.stə.kəl/
C1 障碍；阻碍；妨碍
something that blocks you so that movement, going forward, or action is prevented or made more difficult
The biggest obstacle in our way was a tree trunk in the road. 我们路上最大的障碍是横在路上的一棵树。
This decision has removed the last obstacle to the hostages' release. 这个决定清除了释放人质的最后障碍。