Chromakey
色度键（指在胶片原有图像上添加图像）
🗣️ 情景例句
Radiation exposure can damage your genes and make them vulnerable to mutation.
辐射会破坏你的基因组织，使它们突变。
This is Mary Speaking.
我是玛丽。
But wouldn't you like to spend an extra day or two here?
你们不愿意在北京多待一天吗？