second-string

adj [attrib 作定语] (of a sports player) being a substitute, rather than a regular player （指运动员）替补的.

sebaceous, sec, secateurs, secede, secession, seclude, secluded, seclusion, second, second cousin, second floor, second hand, second in command, second lieutenant, second sight, second-best, second-degree, second-guess, second-hand, second-rate, secondarily, secondary, seconder, secondhand, secondly, secondment, secrecy, secrecy (title), secret, secret agent (also agent), secret police, secret service, secretarial, secretariat, secretary, Secretary of State, Secretary-General, secrete, secretion, secretive,