Apf
abbr. 动物蛋白因子（animal protein factor）；精确测位雷达（Accurate Position Finder）；纸张精轧机协会（Association of Paper Finishers）
🗣️ 情景例句
when it's very cold out.
冬天外面很冷的时候。
Absolutely.
是这样；当然是；绝对如此。
No, she's much younger than I am. She only started here this term.
对，她年纪比我小得多。她是这个学期才进校学习的。