Chromakey
色度键（指在胶片原有图像上添加图像）
🗣️ 情景例句
I'm taking that bus also.
我也是搭那班车的。
We really can't discount the price more than six percent.
我们真的无法提供超过6%的折扣。
Check the prices before you decide whether to buy one.
先把价格核对一下，再决定该不该买。