fade-in

n (cinema or broadcasting 电影或广播) gradual strengthening (of sounds, pictures, etc) （声音、 画面等）逐渐清晰, 渐现, 渐显, 淡入.

factionalism, factious, factitious, factor, factorable, factorial, factorization, factorisation, factorize, factorise, factory, factory farm, factory ship, factotum, factual, factually, faculty, fad, faddiness, faddish, faddy, fade, fade-out, faded, faecal (US fecal), faeces (US feces), fag, fag-end, faggot (US fagot), fah, Fahrenheit, faience, fail, fail in, fail to, fail-safe, failing, failure, faint, faint-hearted, faint-heartedly, faint-heartedness,