Subharmonic
[电] 次谐波
🗣️ 情景例句
Our competitor has a better product. There's no denying it.
无可否认，我们的竞争对手拥有更好的产品。
How's your son?
你的表兄好吗？
I have a letter of introduction here.
我这儿有一封介绍信。