Pecm
abbr. passive electronic countermeasures 被动电子对抗，无源[消极]电子干扰; Preliminary Engineering Change Memorandum 初步工程更改备忘录（美国空军）; processing element control memory 处理单元控制存储器
🗣️ 情景例句
People don't ask unmarried people Why are you single?.
人们不会问未婚的人“你为什么不结婚？”。
An old dog will learn no new tricks.
老家夥学不出新名堂。
It's black. It's a black car.
是黑色的，一辆黑色的车。