pot·hole /ˈpɑtˌhol/
壺洞
Pot·hole n. A circular hole formed in the rocky beds of rivers by the grinding action of stones or gravel whirled round by the water in what was at first a natural depression of the rock.
◄ ►
pothole
n : a pit or hole produced by wear or weathering (especially in
a road surface) [syn: chuckhole]