Only US firefighters and repairmen can use the buttons to speed up the door-closing process if they have a code or special keys.
只有美国消防员和维修人员有密码或者特殊的钥匙时，他们才能按按钮加速关门的过程。
A few special keys are used in NLTK, different ones by the various subpackages.
在NLTK中使用了一些专门的键，不同的键由不同的子程序包所使用。
Another prevention method was through elaborate locking rings which made meters non-removable, except with special keys.
另一个预防措施就是安装精制的锁环，使仪表非得用特备的钥匙才能移动。
Another prevention method was through elaborate locking rings which made meters non - removable, except with special keys.
另一个预防措施就是安装精制的锁环，使仪表非得用特备的钥匙才能移动。
Another prevention method was through elaborate locking rings which made meters non - removable, except with special keys.
另一个预防措施就是安装精制的锁环，使仪表非得用特备的钥匙才能移动。
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