Hdf
abbr. high-frequency direction finder 高频测向器
🗣️ 情景例句
It's only a suggestion, and you can do what you please.
这只是个建议，你可按照你的意愿去做。
Foam plastics are applied to protect the goods against press.
泡沫塑料用来防止挤压。
Try and stand up.Can you stand up?
试试站起来。你能站起来吗？