stand-in

US /ˈstænd.ɪn/
UK /ˈstænd.ɪn/
"stand-in" picture
1.

替身, 代演者

a person who substitutes for another, especially in a performance or dangerous stunt

:
The actor had a stand-in for the dangerous car chase scene.
这位演员在危险的汽车追逐戏中使用了替身
She worked as a stand-in for the lead singer when she was ill.
她生病时,她担任主唱的替补