告密者

wǒ yǒng yuǎn yě bù huì zuò gào mì zhě

我永远也不会做告密者。

I would never act as an informer.

yī gè gào mì zhě shēng chēng yuē hàn shì gè jiàn dié

一个告密者声称约翰是个间谍。

An informer alleged that John was a spy.