A3 is a standard size of paper.

A3 A3是a standard size of paper一種標準紙張尺寸

One sheet is 297 millimetres by 420 millimetres — about the size of two A4 sheets placed side by side.

One sheet一張紙297 millimetres by 420 millimetres是297毫米乘420毫米about the size of two A4 sheets placed side by side大概是兩張A4紙並排放的大小

Schools, offices, and print shops in Europe, Japan, and Taiwan use it for posters, big tables, music, and drawings that need more room than a normal printer page.

Schools, offices, and print shops in Europe, Japan, and Taiwan歐洲、日本、台灣的學校、辦公室和印刷店use it用它for posters, big tables, music, and drawings來印海報、大表格、樂譜和圖畫that need more room than a normal printer page那些需要比一般印表機紙張更多空間的東西

It belongs to the international A-series of paper sizes (ISO 216). In that system each next size is half the one before, cut parallel to the shorter side, so A3 is twice A4, and A2 is twice A3.

It belongs to the international A-series of paper sizes (ISO 216)它屬於國際A系列紙張尺寸(ISO 216)In that system在這個系統裡each next size is half the one before每一個下一階尺寸都是前一階的一半cut parallel to the shorter side沿著短邊裁切so A3 is twice A4所以A3是A4的兩倍and A2 is twice A3而A2是A3的兩倍

In the United States people more often use sizes called letter and tabloid, so A3 is less common there.

In the United States在美國people more often use sizes called letter and tabloid人們更常用叫做letter和tabloid的尺寸so A3 is less common there所以A3在那裡比較少見

When someone says “print it on A3,” they mean this large standard sheet, not a special kind of paper.

When someone says "print it on A3,"當有人說「print it on A3」they mean this large standard sheet他們指的是這種大型標準紙張not a special kind of paper不是什麼特別的紙