To go through an official document before it is shown to the public and take out the parts that must stay secret — names, addresses, anything that would put someone in danger or break a rule. In practice this usually means covering the words with thick black bars, so what remains is a page of ordinary text with black stripes through it.

To go through an official document在公文公開給大眾看之前 before it is shown to the public先審過它, and take out the parts that must stay secret拿掉那些必須保密的部分——names, addresses像姓名、地址, anything that would put someone in danger or break a rule或任何會讓人陷入危險、違反規定的內容。 In practice實際做法上 this usually means covering the words with thick black bars通常就是用粗黑條蓋住那些字, so what remains is讓剩下的 a page of ordinary text with black stripes through it變成一頁有黑條穿過的普通文字。

You redact a document, or you redact the information itself: 'the names were redacted'. The past participle is used constantly as an adjective — 'a redacted report', 'heavily redacted'.

You你 redact a document可以redact一份文件, or you redact the information itself或直接redact那個資訊本身: 'the names were redacted''the names were redacted'（姓名被塗黑了）。 The past participle過去分詞 is used constantly as an adjective常常當形容詞用——'a redacted report'像'a redacted report', 'heavily redacted'或'heavily redacted'。

This is a formal word from law, government and journalism, not everyday speech; a student will meet it in the news.

This這 is a formal word from law, government and journalism是來自法律、政府、新聞業的正式字, not everyday speech不是日常口語; a student will meet it in the news學生會在新聞裡遇到它。

There is an older, quite different meaning that you may still see in academic writing about texts: to edit or prepare a piece of writing for publication, putting material into its final form. That sense is now rare outside scholarship, and if you say 'redact' today people will assume you mean the black bars.

There is有 an older, quite different meaning一個較舊、相當不同的意思 that you may still see in academic writing about texts你可能還會在談文本的學術寫作裡看到: to edit or prepare a piece of writing for publication指編輯、整理一篇文章準備出版, putting material into its final form把內容整理成最終定稿。 That sense這個詞義 is now rare outside scholarship現在除了學術界之外很少見, and if you say 'redact' today而如果你今天說'redact', people will assume you mean the black bars大家會以為你是在講塗黑那件事。