infiltrate

动词 infiltrate:

1. cause (a liquid) to enter by penetrating the interstices
2. enter a group or organization in order to spy on the members
   同义词：penetrate
3. pass into or through by filtering or permeating
4. pass through an enemy line; in a military conflict
   同义词：pass through

1. He joined the party and turned out to be a wolf in sheep's clothing because he was sent to infiltrate our group for the extreme right wingers.
   他加入了我们的党，结果却是一只披着羊皮的豺狼，因为他是被极右分子派来混在我们的团体之中的。
2. Beware of the fifth column. They often infiltrate into key positions and seek to undermine the body politic from within.
   要提防隐蔽的敌人，他们经常渗透到关键岗位企图从内部破坏国家政体。
3. The teacher tried to infiltrate her ideas into the children's minds.
   老师设法把她的思想渗透到孩子们的心中。

in.fil.trate

v.（动词）
in.fil.trat.ed,in.fil.trat.ing,in.fil.trates
v.tr.（及物动词）

To pass (troops, for example) surreptitiously into enemy-held territory.
潜入：偷偷将（如军队）派遣进入敌人占领的地区
To penetrate with hostile intent:
渗透：怀着敌意而渗透进入：
例句：
infiltrate enemy lines; a team of terrorists that had infiltrated the country.
渗入敌军防线；一队渗入该国的恐怖分子

To enter or take up positions in gradually or surreptitiously, as for purposes of espionage or takeover:
混入，接收：秘密地或逐渐地进入或获取职位，目的是间谍行为或掌握政权：
例句：
tried to infiltrate key government agencies with spies.
派间谍试图渗透进政府的关键职位

To cause (a liquid, for example) to permeate a substance by passing through its interstices or pores.
渗透：透过间隙或小孔使一种物质（如水）渗过另一种物质
To permeate (a porous substance) with a liquid or gas.
使浸透：用水或气体穿过多孔物质
v.intr.（不及物动词）
To gain entrance gradually or surreptitiously.
渗透：逐渐地或秘密地获得进入权
n.（名词）
One that infiltrates, especially an abnormal substance that accumulates gradually in cells or body tissues.
渗透物：能渗透的物质，尤指一种能在细胞或人体组织中聚集的异常物质

【引伸】
infil.trator
n.（名词）