1 sentence

1. 他在敌军内部长期潜伏，主要负责搜集情报和反谍。

   tā zài dí​jūn nèi​bù cháng​qī qián​fú, zhǔ​yào fù​zé sōu​jí qíng​bào hé fǎn​dié.

   He was undercover inside the enemy forces for a long time, mainly responsible for intelligence gathering and counter-espionage.

   Source: Dong Chinese Dictionary