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
Did you know her husband has a secret lover?
你知道她的丈夫有一个秘密情妇吗？
Good afternoon, sir.
下午好，先生。
and we know something of the great variety of the sea bed's topography.
而且我们对海底地形的千变万化也有了一定的了解。