Hfo
abbr. heavy fuel oil 重（燃）油; high-frequency oscillator 高频振荡器
🗣️ 情景例句
May I have your name, Please?
请问尊姓大名？
All is well that ends well.
结果美满都是好的。
will finally become so steep that we can live no longer,
但最终会急转直下，我们也无法再活下去了。