Hfo
abbr. heavy fuel oil 重（燃）油; high-frequency oscillator 高频振荡器
🗣️ 情景例句
I believe my English fluency is quite good.
我认为自己的英语相当的流利。
Better go to bed supperless than rise in debt.
宁可饿肚子，切莫去借债。
Apart from an interesting-looking carved dagger, the box was full of crockery, much of it broken.
除了一柄式样别致、雕有花纹的匕首外，货箱内装满陶器，而且大部分都已破碎裂。