A4
n. A4型纸（规格为297×210毫米的纸）
🗣️ 情景例句
I have a tourist visa.
旅游签证。
Geographically,this country is located in the southern hemisphere.
这个国家在地理上位于南半球。
They are only too delighted to accept the invitation.
他们非常乐意接受邀请。