A4
n. A4型纸（规格为297×210毫米的纸）
🗣️ 情景例句
Please give me a general view first, will you?
首先，请给我一个大概的介绍，行吗？
I'm awfully sorry.
真是对不起。
As we were walking past a shop, he held a diamond firmly against the window and made a deep impression in the glass.
我们路过一家商店时，他将一颗钻石使劲地往橱窗上一按，在玻璃上留下一道深痕。