N
a terrorist who is not currently active but assumes a guise in order to be in position, unsuspected, for future terrorist activities 睡眠的恐怖分子; 虽不再活跃但隐藏起来伺机而动的恐怖分子
It is only natural to contemplate the possibility that Hasan's education and officer status, denoting his higher function, reflect on him as a sleeperterrorist.