In email, bcc means you are sending a hidden copy. People in the To and cc lines cannot see the bcc names, and the bcc people usually cannot see one another either.

In email在電子郵件裡, bcc means bcc 的意思是 you are sending a hidden copy你送出了一份隱藏的副本. People in the To and cc lines在收件人和副本欄裡的人 cannot see the bcc names看不到密件副本的名字, and the bcc people usually cannot see one another either而密件副本的人彼此通常也看不到。

You use it when someone should know about the mail without showing their address to the whole group, or when you write to many people and do not want to leak everyone’s email.

You use it你會用它 when someone should know about the mail without showing their address to the whole group當你想讓某人知道這封信、但不想把他的信箱曝光給整個群組, or when you write to many people and do not want to leak everyone's email或是你寫信給很多人、不想洩漏大家的信箱。

It is office language; mail programs print it as bcc or Bcc.

It is office language它是辦公室用語; mail programs print it as郵件軟體會印成 bcc or Bcc bcc 或 Bcc。

Though actually, nobody is using carbon paper any more — the name is a leftover from old offices, where a “carbon copy” was a spare made by sliding carbon paper under a letter, and “blind” meant the others were kept in the dark about who got that spare.

Though actually不過事實上, nobody is using carbon paper any more現在已經沒有人用複寫紙了 — the name is a leftover from old offices這個名字是舊時代辦公室留下來的, where a 'carbon copy' was a spare那時候『carbon copy』（副本）指的是 made by sliding carbon paper under a letter在信紙下墊複寫紙做出來的一份副本, and 'blind'而『blind』（密） meant the others were kept in the dark about who got that spare意思是其他人不知道還有誰拿到了那份副本。

Putting someone in bcc does not make the mail secret in every other way; it only hides that name from the list the others can see.

Putting someone in bcc把某人放進密件副本 does not make the mail secret in every other way並不會讓這封信在其他方面都變得機密; it only hides that name from the list the others can see它只是不讓其他人看到的名單上出現那個名字。