Backprojection
幕后投影; 背景放映
🗣️ 情景例句
OK.
喂。
To answer the first part of your question, I'd like to say that our studies were very extensive.
你问题的第一部分，我要说的就是我们的研究非常广泛。
Where can I check in?
在哪儿办理登记手续？