Padar
abbr. passive airborne detection and ranging 被达, 机载无源探测定位系统; passive detection and ranging 被动探测与测距
🗣️ 情景例句
That idea would never work in practice.
那种设想永远实现不了。
He that has a full purse never wants a friend.
只要袋里有，不愁没朋友。
Yet a great many processes depending on such research are sought for with complete secrecy until the stage at which patents can be taken out.
然而，依赖这种研究的很多工艺程序是在完全保密的情况下进行的，直到可以取得专利权的阶段为止。