This memo could be the smoking gun that investigators have been looking for.

这份备忘录可能是调查人员一直在寻找的证据。

《牛津高阶英汉双解词典》

Police are still looking for a smoking gun in the kidnapping case.

警察仍然在寻找绑架案的有力证据.

辞典例句

The smoking gun was the lipstick on his collar.

他衣领上的口红是确凿的证据.

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