Chromakey
色度鍵（指在膠片原有圖像上添加圖像）
??? 情景例句
That's a large city in northern Greece.
那是希臘北部的一個大城市。
In the kingdom of blind men, the oneeyed is king.
生在盲人國，獨眼也稱王。
Looking up I saw that we were surrounded by children in rags who were looking at us silently as we ate.
我抬頭一看，發現我們被一群衣衫襤褸的小孩團團圍住了，他們在默不作聲地看著我們吃飯。