understudy
n
~ (to sb) person who learns the part of another in a play, etc in order to be able to take his place at short notice if necessary 候补演员; 替手
(fig 比喻) The Vice-President acts as understudy to the President. 副总统是总统的替手. understudy, v (pt, pp -died) [Tn]
learn (eg a part in a play) as understudy; act as understudy to (sb) 排练(如剧中角色)充当候补演员; 当(某人)的替手
understudy (the role of) Ophelia 排练奥菲利亚(一角)当候补演员
She understudied Judi Dench. 她充当朱迪.登奇的替手.