Postamplifier
后置放大器
🗣️ 情景例句
... and I do need some advice on a difficult problem.
……我的确有一个难题要请教你。
If she could help you, she would help you.
如果她能帮你的话，她会帮你的。
You have a good command of English.
你的英文能力很强。