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
and it's only about an hour's drive from here.
而且从此地到那里只有大约一小时的车程。
To break the routine.
调剂一下。
If you hate science stories, you are unlikely to enjoy reading them in English.
如果你不喜欢读科学小品，你很可能也不会喜欢读英文的这类图书。