permissive action短语¹⁴⁴⁹⁷²⁺² 基本例句 允许作用 They also devised technologies— permissive action links, go codes, and redundant command-control links—that minimized the chance of accidental or unauthorized launches. 他们还采用各种技术，例如行动授权环节，密码和多保险的指挥控制环节，来减少意外或未经授权发射的可能性。 yeeyan