Hfo
abbr. heavy fuel oil 重（燃）油; high-frequency oscillator 高频振荡器
🗣️ 情景例句
Oh?
噢？
Riches serve a wise man but command a fool.
财富事智者，却又驭蠢人。
This is a telephone with a tape recorder.
这是一台带有磁带录音机的电话。