短语词组短語hollow abdomen gravity dam 空腹垻斷麪hollow arbor gravity dam 空心重力垻stone masonry hollow gravity dam 砌石空腹重力垻hollow arch -gravity dam 空腹重力拱垻stone masonry -hollow gravity dam 砌石空腹重力垻gravity hollow dam 空腹重力垻 返回 hollow gravity dam