记者从一位保密的消息人士那里获得了信息。

The journalist received the information from a confidential ___source.

调查人员正试图保护他们的主要线人。

Investigators are trying to protect their main ___source.

根据警方的消息来源，嫌疑人已经离开了这个国家。

According to police ___sources, the suspect has left the country.