内奸

qīng chú nèi jiān

清除内奸

ferret out enemy agents

wǒ dān xīn wǒ men zhōng jiān yǒu nèi jiān

我担心我们中间有内奸。

I fear we have an enemy in our midst.

zài wǒ kàn lái nǐ jiù shì nèi jiān

在我看来，你就是内奸。

For all I know, you're the rat.

tā men huái yí zǔ zhī li bèi ān chā le nèi jiān

他们怀疑组织里被安插了内奸。

They suspected that a mole had been planted in the organization.