English Dictionary

green door

noun

(espionage) the barrier between compartmentalized intelligence information and those without access to it, especially military personnel who might need it

I painted the green door.

意味（1）

(espionage) the barrier between compartmentalized intelligence information and those without access to it, especially military personnel who might need it

While this cannot be done in all cases, no commander should accept the notion that whole blocks of intelligence are permanently behind a special “green door” until his intelligence officer has carefully examined the regulations.