A4
n. A4型纸（规格为297×210毫米的纸）
🗣️ 情景例句
My father sends his regards to you.
我父亲向你问好。
Sure bind, sure find.
捆得好，逃不了。
rising at one-foot intervals all the way to the top of the atmosphere.
并按1英尺的间隔从地面一直排列到大气层的顶端。