R-f amplifier
[电] 射频放大器
🧩 词语组成解析
🗣️ 情景例句
What about your arms? Lift your arms up like this.
你胳膊怎么样?手抬起来， 像这样。
The mailman is delivering letters.
邮差在发信。
Chaplin was born in London in 1889 and first acted when he was five years old.
卓别林1889年出生于伦敦，5岁时就开始演戏。