secret

秘密

She promised to keep my secret and never told anyone.

她答应为我保守秘密，从来没告诉任何人。

机密多指官方或商业

He was accused of selling state secrets to a foreign government.

他被控将国家机密卖给外国政府。

秘诀、诀窍

The secret of good bread is patience and a hot oven.

做出好面包的秘诀在于耐心和够热的烤箱。

秘密的、暗中的

The two sides held secret talks in a hotel basement.

双方在饭店地下室进行秘密会谈。

机密的

These documents are secret and cannot leave the building.

这些文件属于机密，不得带离大楼。

隐密的、隐藏的

There is a secret door behind the bookshelf.

书架后面有一道隐密的门。

不为人知的、暗自的

She had a secret crush on her coworker for years.

她多年来一直暗恋著同事。