reactivate
/ˌri:ˈæktɪveɪt; ri`æktəˌvet/ v[Tn]
bring (sth) back into operation; make active again 使（某物）重新运转; 使恢复活力
reactivate an old generator 使旧发电机重新运转
reactivate a spacecraft's defence system 使宇宙飞船防卫系统重新进入工作状态
reactivate our links/contacts with China 恢复我们与中国的联系.