black box

Другие идиомы:

• as black as pitch
• black out
• blackout
• black market
• black eye
• pot calling the kettle black
• pitch-black
• as black as a sweep
• in (someone's) black books
• put (something) down in black and white
• as black as a skillet
• as black as coal
• as black as the ace of spades
• black and white
• black and blue