The two-letter postal abbreviation for the US state of Arizona — the one you write on an envelope, right before the ZIP code: 'Phoenix, AZ 85001'. Every US state has one of these two-letter codes, set by the postal service, and they are always written with two capital letters and no full stops.

the US state of Arizona美國亞利桑那州的 the two-letter postal abbreviation兩字母郵政縮寫——the one you write on an envelope就是你寫在信封上的，right before the ZIP code就在郵遞區號前面：'Phoenix, AZ 85001'。every US state每個美國州 has one of these two-letter codes都有一個這樣的兩字母代碼，set by the postal service是郵政單位訂的，and they are always written with two capital letters and no full stops一律用兩個大寫字母，不加句點。

Not 'A.Z.', not 'Az'. Use it in addresses, forms, tables, and data — places where space is short.

'A.Z.'不寫成 'A.Z.'，'Az'也不寫成 'Az'。in addresses, forms, tables, and data在地址、表格、表單和資料裡 use it就會用到它——places where space is short這些是空間有限的地方。

In an ordinary sentence you write the full name: 'She moved to Arizona,' not 'She moved to AZ.' Americans do say the letters aloud sometimes ('I'm flying into AZ'), but that is casual speech, and in writing it looks like a shortcut.

in an ordinary sentence在普通句子裡 you write the full name要寫全名：'She moved to Arizona,'「她搬到亞利桑那州」，not 'She moved to AZ.'不會寫成「她搬到 AZ」。Americans do say the letters aloud sometimes美國人有時候會把字母唸出來（'I'm flying into AZ'「我要飛去 AZ」），but that is casual speech不過那是口語，and in writing it looks like a shortcut寫出來就會顯得像是偷懶的縮寫。

Be warned that these letter pairs are reused everywhere: AZ is also the country code for Azerbaijan on the internet (.az) and in some international lists, and companies use it for their own reasons. Context tells you which one you are looking at — an address means Arizona.

these letter pairs are reused everywhere要注意這些兩字母代碼到處被重複使用：AZ is also the country code for Azerbaijan on the internetAZ 同時也是亞塞拜然的網路國碼（.az）and in some international lists也用在一些國際清單裡，and companies use it for their own reasons公司行號也會為了自己的理由使用它。context tells you which one you are looking at前後文會告訴你指的是哪一個——an address means Arizona地址裡出現就是亞利桑那州。