"a layer of material that encloses space; \"the walls of the cylinder were perforated\"; \"the container's walls were blue\""@en-us . "04547821-n"^^ . "104547821"^^ . . . . . . . . "104370836"@en-us . "0"^^ . "0"^^ . . "wall"@en-us . . "wall"^^ .