pothole
noun [ C ] uk/ˈpɒt.həʊl/ us/ˈpɑːt.hoʊl/
(HOLE)
（路面因行车或天气而形成的）凹坑，坑洼
a hole in a road surface that results from gradual damage caused by traffic and/or weather
The car's suspension is so good that when you hit a pothole you hardly notice it. 这部车的悬架减震性很好，碰到路面的坑洼几乎察觉不到。
地穴，壶穴
a deep hole formed underground in limestone areas by the gradual rubbing and dissolving action of water flowing through the stone
(PROBLEM)
困难
a problem
The road to economic recovery is full of potholes. 经济复苏之路充满了艰辛。