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。
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。
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。
