劍橋詞典

official permission for a particular person to enter a building or area or to be given an important job , after making certain that they are not a threat
保安許可證
Some defence jobs require security clearances that are only issued to native-born citizens . 有些國(guó)防部門的工作要求申請(qǐng)人持有保安許可證，而這些許可證是只發(fā)給本國(guó)公民的。 返回 security clearance