a. 空的； （纹章图案）中空的

v. 使无效( void的过去式和过去分词 ); 宣布…作废; 取消; 排泄

v declare invalid

v clear (a room, house, place) of occupants or empty or clear (a place or receptacle) of something

v take away the legal force of or render ineffective

v excrete or discharge from the body