A3
n. A3号纸（尺寸为420×297mm的）
🗣️ 情景例句
I'm just happy that we're able to talk about it.
我很高兴我们能够一起商讨这件事。
The news spread all over the world.
这消息传遍全世界。
It's been open for several years.
它建成已有好几年了。