特务的英文：
special assignment (military)
special agent
operative
spy

参考例句：

The infiltration of spies,troops, etc into an area,organization,etc
特务、部队等向某地区、某组织等的潜入

The Secret Service screened hundreds of students to select its agents.
特务机关仔细审查了数百名学生以选择特务人员。

The children are playing at catching a spy.
孩子们在玩抓特务的游戏。

It turns out that the whole thing was the handiwork of one of the several hundred detachments of secret agents
原来这件事出于几百个特务大队中的一个大队。

The spy was caught alive though he died from wounds the next day.
特务被活捉，不过第二天便因重伤而死。

In any event,all of us must be vigilant and not let a single enemy agent slip in.
无论怎样，我们所有的人都必须警惕，不能让一个特务溜进来。

All these bandits, secret agents and spies are imperialist lackeys
这些土匪、特务和间谍，都是帝国主义的走狗。

On July 15, 1946, he was assassinated in kunming by Kuomintang thugs
一九四六年七月十五日在昆明被国民党特务暗杀。

Microdots are another method of surreptitious communication between an agent in the field and his controller
缩微照片是派出去的特务同控制他的人之间进行秘密通信的又一种方法。

The special agents broke into his room and rummaged through chests and cupboards but couldn't find anything suspicious
那些特务冲进他的房间翻箱倒柜地搜了一遍,但没有发观任何可疑的东西。

special是什么意思：
adj. 特殊的，特别的；专门的，专用的；增加的，额外的
n. 专车；特使；特刊；特别节目

a special contributor
特约撰稿人

Specialness is not the truth in you.
特殊性并不是你内在的真相。

Rhineland dishes are a speciality of the restaurant.
莱茵兰菜是这家饭店的特色菜。

assignment是什么意思：
n.任务；作业；分配，指派

assignable adj.
可分配的；可直定的；可归属的

give an assignment to (a person) to a post, or assign a task to (a person).
派某人到某个职位或分派任务给某人。

make the assignment for the next day
布置第二天的作业