光指示器經(jīng)常與幻燈片放映機(jī)一起使用.A light pointer is often useful with a slide projector.學(xué)校的視聽(tīng)設(shè)備包括放映機(jī)和錄音機(jī).The school's audio apparatus includes films and records.電影放映機(jī)每秒24次重復(fù)這個(gè)過(guò)程,每次一幅圖像.It repeats this process with a new image 24 t...