Vacuum tube detector
[电] 真空管检波器
🧩 词语组成解析
🗣️ 情景例句
Michelle has been a different kid since we've been married.
自从我们结婚之后， Michelle变成另一个人了。
An empty bag cannot stand upright.
空袋不能直立。
Textile business has become more and more difficult since the competition grew.
随着竞争的加剧，纺织品贸易越来越难做了。