Jf
abbr. 纪念邮资信封
🗣️ 情景例句
I take this threat very seriously.
我认为这种威胁非同小可。
I will be very glad when I receive the letter.
如能接到你的来信，我将会非常高兴。
then administrative overheads will be low.
行政管理费用就会降低。