encryption（密码）：为了保守秘密，只限当事人知道、规定、修改的特殊信号。 access control system（门禁管理系统）：对特定场所的出入进行管理的系统。
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但是，科林斯却请他们带他去相反的方向，他告诉他们这架飞机载有核武器————这是事先安排好的说辞，是为了保守51区飞机的秘密。
Instead, Collins got them to give him a ride in the opposite direction, by telling them the plane had a nuclear weapon on board—a prearranged cover story to keep the Area 51 craft a secret.
为了使他的生活像正常状态一样而保守这个秘密，这对他来说意味着什么呢？
What was it like for him, to keep this secret in order to have some semblance of normality in his life?
她誓守诺言，为了我的缘故而保守秘密。
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