black box (装有专门发报机、供总统下令发射核弹的箱子) 那只著名的～——标志核时代权力转移的丑恶的百宝箱——则交由一名军事助理保管着。The famous black box—an ugly talisman that signified the transfer of power in the nuclear age—was left behind with a military aide./～办法black-box approach /～操作under-the-counter operation