v.充當(dāng)（某角色的）候補(bǔ)演員

n.候補(bǔ)演員

When the star became sick,his understudy stepped into his part. 當(dāng)這位電影明星生病時(shí)，由他的候補(bǔ)演員擔(dān)任他的角色。

She got the part and I was her understudy. 她得到了這個(gè)角色，我只能作為替補(bǔ)的臨時(shí)演員。