spy on 监视
secret spies 秘密间谍
intelligence agency 情报机构
detective work 侦探工作
A: Who are those people in the black coats?
A：那些穿黑大衣的人是谁？
B: I think they are spies sent by the enemy.
B：我想他们是敌人派来的间谍。
1) 间谍，侦察员
2) 窥探，监视
3) 察觉，发现
1. 间谍；侦察员
2. 窥探；监视
noun
1. people who collect secret information about a country or organization
verb
1. to watch and listen to people secretly in order to get information