All of this brainwashing makes this young man the perfect sleeper agent.

所有这些洗脑使这个年轻人成为完美的卧底特工。

In this case, the sleeper agent is activated or made to go into action when he's shown this playing card, this Queen of Diamonds, and given instructions about the next person he's supposed to kill.

在这种情况下，当他出示这张扑克牌， 这张方块皇后， 并给出关于他应该杀死的下一个人的指示时， 卧铺特工被激活或开始行动。