撤销

cancel;rescind;revoke;invalidate
～订货单cancel an order/～处分rescind(or annul)a penalty/～对承受条约拘束之同意invalidate one’s consent to be bound by a treaty/～法令repeal a decree/～决议revoke(or annul)a decision/～命令countermand an order/～通知或文书revoke a notification or instrument/～邀请withdraw an invitation/～职务dismiss a person from his post