Hdf
abbr. high-frequency direction finder 高频测向器
🗣️ 情景例句
If you want to make the intelligent choice, Trust me on this.
如果你想作出明知的抉择，那就相信我吧。
I ate oatmeal for breakfast yesterday.
我昨天早饭吃的是麦片。
the graphic record shows three waves arriving one after the other at short intervals.
曲线纪录就能显示出前后相间的这3种地震波。