短語詞組短語hollow abdomen gravity dam 空腹壩斷面hollow arbor gravity dam 空心重力壩stone masonry hollow gravity dam 砌石空腹重力壩hollow arch -gravity dam 空腹重力拱壩stone masonry -hollow gravity dam 砌石空腹重力壩gravity hollow dam 空腹重力壩 返回 hollow gravity dam