"the south wall had a small window" "the walls were covered with pictures"
"a wall of water" "a wall of smoke" "a wall of prejudice" "negotiations ran into a brick wall"
"stomach walls"
"his back was to the wall" "competition was pushing them to the wall"
"the walls of the cylinder were perforated" "the container's walls were blue"
"the wall followed the road" "he ducked behind the garden wall and waited"
"they stormed the ramparts of the city" "they blew the trumpet and the walls came tumbling down"
误 Have you seen the hole on the wall?
正 Have you seen the hole in the wall?
析 表示墙上有洞〔门〕时,要用in the wall,因为洞〔门〕都是在墙里面。如指在墙表面上,则用on the wall。