Hfo
abbr. heavy fuel oil 重（燃）油; high-frequency oscillator 高频振荡器
🗣️ 情景例句
Marketing promotion.
市场推广。
On a cold day, a warm fireplace feels very nice.
在天寒地冻的日子，温暖的炉火旁是很舒服的。
I've got some small change.
我有零钱。