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
I have interviews until noon,
我从现在到中午， 有一系列的面谈，
Thanks a lot.
多谢。
The house was dirty. They hadn't cleaned it for weeks.
房子很脏，他们好几个星期没打扫了。