fill-in /ˈfɪlˌɪn/
臨時填補空缺的人,臨時填補物(a.)臨時填補性的
fill-in
n : someone who takes the place of another (as when things get
dangerous or difficult); "the star had a stand-in for
dangerous scenes"; "we need extra employees for summer
fill-ins" [syn: stand-in, substitute, relief, reliever,
backup, backup man]