second in command

person next below the commanding officer, most senior official, etc in rank 级别仅次於指挥官、 最高级负责人等的人: the sales director and her second in command 销售部经理和她的助理.

seat-belt (also `safety-belt), seating, SEATO, seaward, seawards, seaweed, seaworthiness, seaworthy, sebaceous, sec, secateurs, secede, secession, seclude, secluded, seclusion, second, second cousin, second floor, second hand, second lieutenant, second sight, second-best, second-degree, second-guess, second-hand, second-rate, second-string, secondarily, secondary, seconder, secondhand, secondly, secondment, secrecy, secrecy (title), secret, secret agent (also agent), secret police, secret service,