Fof
abbr. free on field (airmail) 野外免费
🗣️ 情景例句
What was your best subject in college?
大学时你哪门功课最好？
A book that remains shut is but a block.
有书闭卷不阅读，无异是一块木头。
On weekdays, I get up at 6:30.
我平时六点半起床。