Velocity-variation amplifier
[电] 变速放大器
🧩 词语组成解析
🗣️ 情景例句
What are you doing?
你在干什么？
He can't come and he sends his apologies.
他为他的不能前来致歉。
When Aunt Huang came back, I was so tired. In the evening Liu Ming came to see me.
当黄阿姨回来的时候，我累极了。晚上刘明来看我。