[hidden traitor] 隐藏在内部进行破坏的人 [thief in the family is difficult to detect; a thief from within is hard to guard against;it is difficult to forestall a...
3
?暗藏在内部做破坏活动的人
[hidden traitor;secret enemy agent within one's ranks] 暗藏在内部做破坏活动的人 [be intense inside and relaxed outside] 有时指政策的收紧与放宽,有时也指人的心情,即内心紧张,态度镇静 ..