Fof
abbr. free on field (airmail) 野外免费
🗣️ 情景例句
Eating salad is good for your health.
多吃色拉（蔬菜）对你的健康有益。
Never put off till tomorrow what you can do today.
今天能做的事绝不要拖到明天。
but each year, the dogs are still sent out into the snow whenever a traveller is in difficulty.
但每年还要派狗到雪山地里去帮助那些遇到困难的旅游者，