You write N.B. (sometimes NB, with no dots) in front of a short note when you want the reader to stop and really look. It is a writer's tap on the shoulder: this bit matters.

You write你會寫 N.B.N.B.。(sometimes NB, with no dots)（有時候寫成NB，不加點） in front of a short note放在一段簡短提醒的前面, when you want the reader to stop and really look用在你希望讀者停下來仔細看的時候。It is a writer's tap on the shoulder這是作者拍你肩膀提醒你的動作: this bit matters這一段很重要。

You see it on worksheets, in emails, in notices, and in contracts — much more in writing than in speech. When people do say it, they name the letters: “N B.” It feels a little formal and a little old-fashioned, like something a teacher or an office might put on a page; younger writers often just put Note: or Please note. Though actually, school papers and official documents still use it a lot.

You see it你會看到它 on worksheets, in emails, in notices, and in contracts在習題單、電子郵件、公告和合約裡 — much more in writing than in speech比起口語，文字裡用得多很多。When people do say it如果真的要唸出來, they name the letters大家會唸出字母: "N B.""N B." It feels a little formal and a little old-fashioned感覺有點正式、有點老派, like something a teacher or an office might put on a page像老師或辦公室會寫在紙上的東西; younger writers often just put Note: or Please note年輕一輩的作者常常就直接寫Note:或Please note。Though actually不過, school papers and official documents still use it a lot學校報告和官方文件還是很常用它。

It is not the same job as P.S., which adds an afterthought after a letter is already finished. N.B. can sit anywhere you need a warning flag.

It is not the same job as P.S.它跟P.S.的功能不一樣, which adds an afterthought after a letter is already finishedP.S.是在一封信寫完之後補加的想法。N.B. N.B. can sit anywhere可以放在任何 you need a warning flag你需要豎起警示旗的地方。