smoking gun片语

铁证、确凿的证据、铁证如山

Investigators finally found the smoking gun in his emails.

调查人员终于在他的电子邮件里找到了铁证。

铁证、关键证据多用于否定句

There is no smoking gun linking the company to the leak.

目前没有铁证能把这家公司和泄密事件连在一起。

决定性的、确凿的

The recording was the smoking-gun evidence the prosecution needed.

那段录音正是检方需要的决定性证据。