A3
n. A3号纸（尺寸为420×297mm的）
🗣️ 情景例句
It is a great idea,
这是个极好的主意。
It's easy to fall into a trap, but hard to get out again.
堕入陷阱易，脱离陷阱难。
He has been able to tell us more about active volcanoes than any man alive.
他能告诉我们的有关活火山的情况比任何在世的人都要多。