他们知道自己已经被识破了。
特工深知，一旦自己的身份被识破，等待他的命运将和珀耳一样、在同一地点被斩首示众。
He knew that if his identity were blown, he would be beheaded on the spot in the same way as Pearl.
也许这样便于知更鸟识破其巢寄生的鸟类将自己蛋放进知更鸟巢吧！
Perhaps this enables robins to spot when a parasitic bird tries to add its own eggs to the nest.
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