Hfo
abbr. heavy fuel oil 重（燃）油; high-frequency oscillator 高频振荡器
🗣️ 情景例句
Hi, Alexandra. Welcome.
嗨 Alexandra。欢迎。
I can't tell what will happen.
我可说不出将会发生什么事。
The number 13 bus will take you to the hospital.
13路车会带你去医院。